P. 79 of Theorem List - Intuitionistic Logic Explorer

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**Theorem List for Intuitionistic Logic Explorer -** 7801-7900 *Has distinct variable group(s)
Type	Label	Description
Statement

Theorem	ltexprlemell 7801*	Element in lower cut of the constructed difference. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝑞 ∈ (1^st ‘𝐶) ↔ (𝑞 ∈ Q ∧ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑞) ∈ (1^st ‘𝐵))))

Theorem	ltexprlemelu 7802*	Element in upper cut of the constructed difference. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝑟 ∈ (2^nd ‘𝐶) ↔ (𝑟 ∈ Q ∧ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑟) ∈ (2^nd ‘𝐵))))

Theorem	ltexprlemm 7803*	Our constructed difference is inhabited. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (∃𝑞 ∈ Q 𝑞 ∈ (1^st ‘𝐶) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2^nd ‘𝐶)))

Theorem	ltexprlemopl 7804*	The lower cut of our constructed difference is open. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ ((𝐴<_P 𝐵 ∧ 𝑞 ∈ Q ∧ 𝑞 ∈ (1^st ‘𝐶)) → ∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐶)))

Theorem	ltexprlemlol 7805*	The lower cut of our constructed difference is lower. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ ((𝐴<_P 𝐵 ∧ 𝑞 ∈ Q) → (∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐶)) → 𝑞 ∈ (1^st ‘𝐶)))

Theorem	ltexprlemopu 7806*	The upper cut of our constructed difference is open. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ ((𝐴<_P 𝐵 ∧ 𝑟 ∈ Q ∧ 𝑟 ∈ (2^nd ‘𝐶)) → ∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐶)))

Theorem	ltexprlemupu 7807*	The upper cut of our constructed difference is upper. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 21-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ ((𝐴<_P 𝐵 ∧ 𝑟 ∈ Q) → (∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐶)) → 𝑟 ∈ (2^nd ‘𝐶)))

Theorem	ltexprlemrnd 7808*	Our constructed difference is rounded. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (∀𝑞 ∈ Q (𝑞 ∈ (1^st ‘𝐶) ↔ ∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐶))) ∧ ∀𝑟 ∈ Q (𝑟 ∈ (2^nd ‘𝐶) ↔ ∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐶)))))

Theorem	ltexprlemdisj 7809*	Our constructed difference is disjoint. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → ∀𝑞 ∈ Q ¬ (𝑞 ∈ (1^st ‘𝐶) ∧ 𝑞 ∈ (2^nd ‘𝐶)))

Theorem	ltexprlemloc 7810*	Our constructed difference is located. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → ∀𝑞 ∈ Q ∀𝑟 ∈ Q (𝑞 <_Q 𝑟 → (𝑞 ∈ (1^st ‘𝐶) ∨ 𝑟 ∈ (2^nd ‘𝐶))))

Theorem	ltexprlempr 7811*	Our constructed difference is a positive real. Lemma for ltexpri 7816. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → 𝐶 ∈ P)

Theorem	ltexprlemfl 7812*	Lemma for ltexpri 7816. One direction of our result for lower cuts. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (1^st ‘(𝐴 +_P 𝐶)) ⊆ (1^st ‘𝐵))

Theorem	ltexprlemrl 7813*	Lemma for ltexpri 7816. Reverse direction of our result for lower cuts. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (1^st ‘𝐵) ⊆ (1^st ‘(𝐴 +_P 𝐶)))

Theorem	ltexprlemfu 7814*	Lemma for ltexpri 7816. One direction of our result for upper cuts. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (2^nd ‘(𝐴 +_P 𝐶)) ⊆ (2^nd ‘𝐵))

Theorem	ltexprlemru 7815*	Lemma for ltexpri 7816. One direction of our result for upper cuts. (Contributed by Jim Kingdon, 17-Dec-2019.)
⊢ 𝐶 = ⟨{𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (2^nd ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (1^st ‘𝐵))}, {𝑥 ∈ Q ∣ ∃𝑦(𝑦 ∈ (1^st ‘𝐴) ∧ (𝑦 +_Q 𝑥) ∈ (2^nd ‘𝐵))}⟩ ⇒ ⊢ (𝐴<_P 𝐵 → (2^nd ‘𝐵) ⊆ (2^nd ‘(𝐴 +_P 𝐶)))

Theorem	ltexpri 7816*	Proposition 9-3.5(iv) of [Gleason] p. 123. (Contributed by NM, 13-May-1996.) (Revised by Mario Carneiro, 14-Jun-2013.)
⊢ (𝐴<_P 𝐵 → ∃𝑥 ∈ P (𝐴 +_P 𝑥) = 𝐵)

Theorem	addcanprleml 7817	Lemma for addcanprg 7819. (Contributed by Jim Kingdon, 25-Dec-2019.)
⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ 𝐶 ∈ P) ∧ (𝐴 +_P 𝐵) = (𝐴 +_P 𝐶)) → (1^st ‘𝐵) ⊆ (1^st ‘𝐶))

Theorem	addcanprlemu 7818	Lemma for addcanprg 7819. (Contributed by Jim Kingdon, 25-Dec-2019.)
⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ 𝐶 ∈ P) ∧ (𝐴 +_P 𝐵) = (𝐴 +_P 𝐶)) → (2^nd ‘𝐵) ⊆ (2^nd ‘𝐶))

Theorem	addcanprg 7819	Addition cancellation law for positive reals. Proposition 9-3.5(vi) of [Gleason] p. 123. (Contributed by Jim Kingdon, 24-Dec-2019.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ 𝐶 ∈ P) → ((𝐴 +_P 𝐵) = (𝐴 +_P 𝐶) → 𝐵 = 𝐶))

Theorem	lteupri 7820*	The difference from ltexpri 7816 is unique. (Contributed by Jim Kingdon, 7-Jul-2021.)
⊢ (𝐴<_P 𝐵 → ∃!𝑥 ∈ P (𝐴 +_P 𝑥) = 𝐵)

Theorem	ltaprlem 7821	Lemma for Proposition 9-3.5(v) of [Gleason] p. 123. (Contributed by NM, 8-Apr-1996.)
⊢ (𝐶 ∈ P → (𝐴<_P 𝐵 → (𝐶 +_P 𝐴)<_P (𝐶 +_P 𝐵)))

Theorem	ltaprg 7822	Ordering property of addition. Proposition 9-3.5(v) of [Gleason] p. 123. (Contributed by Jim Kingdon, 26-Dec-2019.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ 𝐶 ∈ P) → (𝐴<_P 𝐵 ↔ (𝐶 +_P 𝐴)<_P (𝐶 +_P 𝐵)))

Theorem	prplnqu 7823*	Membership in the upper cut of a sum of a positive real and a fraction. (Contributed by Jim Kingdon, 16-Jun-2021.)
⊢ (𝜑 → 𝑋 ∈ P) & ⊢ (𝜑 → 𝑄 ∈ Q) & ⊢ (𝜑 → 𝐴 ∈ (2^nd ‘(𝑋 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑄}, {𝑢 ∣ 𝑄 <_Q 𝑢}⟩))) ⇒ ⊢ (𝜑 → ∃𝑦 ∈ (2^nd ‘𝑋)(𝑦 +_Q 𝑄) = 𝐴)

Theorem	addextpr 7824	Strong extensionality of addition (ordering version). This is similar to addext 8773 but for positive reals and based on less-than rather than apartness. (Contributed by Jim Kingdon, 17-Feb-2020.)
⊢ (((𝐴 ∈ P ∧ 𝐵 ∈ P) ∧ (𝐶 ∈ P ∧ 𝐷 ∈ P)) → ((𝐴 +_P 𝐵)<_P (𝐶 +_P 𝐷) → (𝐴<_P 𝐶 ∨ 𝐵<_P 𝐷)))

Theorem	recexprlemell 7825*	Membership in the lower cut of 𝐵. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐶 ∈ (1^st ‘𝐵) ↔ ∃𝑦(𝐶 <_Q 𝑦 ∧ (*_Q‘𝑦) ∈ (2^nd ‘𝐴)))

Theorem	recexprlemelu 7826*	Membership in the upper cut of 𝐵. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐶 ∈ (2^nd ‘𝐵) ↔ ∃𝑦(𝑦 <_Q 𝐶 ∧ (*_Q‘𝑦) ∈ (1^st ‘𝐴)))

Theorem	recexprlemm 7827*	𝐵 is inhabited. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (∃𝑞 ∈ Q 𝑞 ∈ (1^st ‘𝐵) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2^nd ‘𝐵)))

Theorem	recexprlemopl 7828*	The lower cut of 𝐵 is open. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 28-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ ((𝐴 ∈ P ∧ 𝑞 ∈ Q ∧ 𝑞 ∈ (1^st ‘𝐵)) → ∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐵)))

Theorem	recexprlemlol 7829*	The lower cut of 𝐵 is lower. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 28-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ ((𝐴 ∈ P ∧ 𝑞 ∈ Q) → (∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐵)) → 𝑞 ∈ (1^st ‘𝐵)))

Theorem	recexprlemopu 7830*	The upper cut of 𝐵 is open. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 28-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ ((𝐴 ∈ P ∧ 𝑟 ∈ Q ∧ 𝑟 ∈ (2^nd ‘𝐵)) → ∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐵)))

Theorem	recexprlemupu 7831*	The upper cut of 𝐵 is upper. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 28-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ ((𝐴 ∈ P ∧ 𝑟 ∈ Q) → (∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐵)) → 𝑟 ∈ (2^nd ‘𝐵)))

Theorem	recexprlemrnd 7832*	𝐵 is rounded. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (∀𝑞 ∈ Q (𝑞 ∈ (1^st ‘𝐵) ↔ ∃𝑟 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐵))) ∧ ∀𝑟 ∈ Q (𝑟 ∈ (2^nd ‘𝐵) ↔ ∃𝑞 ∈ Q (𝑞 <_Q 𝑟 ∧ 𝑞 ∈ (2^nd ‘𝐵)))))

Theorem	recexprlemdisj 7833*	𝐵 is disjoint. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → ∀𝑞 ∈ Q ¬ (𝑞 ∈ (1^st ‘𝐵) ∧ 𝑞 ∈ (2^nd ‘𝐵)))

Theorem	recexprlemloc 7834*	𝐵 is located. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → ∀𝑞 ∈ Q ∀𝑟 ∈ Q (𝑞 <_Q 𝑟 → (𝑞 ∈ (1^st ‘𝐵) ∨ 𝑟 ∈ (2^nd ‘𝐵))))

Theorem	recexprlempr 7835*	𝐵 is a positive real. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → 𝐵 ∈ P)

Theorem	recexprlem1ssl 7836*	The lower cut of one is a subset of the lower cut of 𝐴 ·_P 𝐵. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (1^st ‘1_P) ⊆ (1^st ‘(𝐴 ·_P 𝐵)))

Theorem	recexprlem1ssu 7837*	The upper cut of one is a subset of the upper cut of 𝐴 ·_P 𝐵. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (2^nd ‘1_P) ⊆ (2^nd ‘(𝐴 ·_P 𝐵)))

Theorem	recexprlemss1l 7838*	The lower cut of 𝐴 ·_P 𝐵 is a subset of the lower cut of one. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (1^st ‘(𝐴 ·_P 𝐵)) ⊆ (1^st ‘1_P))

Theorem	recexprlemss1u 7839*	The upper cut of 𝐴 ·_P 𝐵 is a subset of the upper cut of one. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (2^nd ‘(𝐴 ·_P 𝐵)) ⊆ (2^nd ‘1_P))

Theorem	recexprlemex 7840*	𝐵 is the reciprocal of 𝐴. Lemma for recexpr 7841. (Contributed by Jim Kingdon, 27-Dec-2019.)
⊢ 𝐵 = ⟨{𝑥 ∣ ∃𝑦(𝑥 <_Q 𝑦 ∧ (_Q‘𝑦) ∈ (2^nd ‘𝐴))}, {𝑥 ∣ ∃𝑦(𝑦 <_Q 𝑥 ∧ (_Q‘𝑦) ∈ (1^st ‘𝐴))}⟩ ⇒ ⊢ (𝐴 ∈ P → (𝐴 ·_P 𝐵) = 1_P)

Theorem	recexpr 7841*	The reciprocal of a positive real exists. Part of Proposition 9-3.7(v) of [Gleason] p. 124. (Contributed by NM, 15-May-1996.) (Revised by Mario Carneiro, 12-Jun-2013.)
⊢ (𝐴 ∈ P → ∃𝑥 ∈ P (𝐴 ·_P 𝑥) = 1_P)

Theorem	aptiprleml 7842	Lemma for aptipr 7844. (Contributed by Jim Kingdon, 28-Jan-2020.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ ¬ 𝐵<_P 𝐴) → (1^st ‘𝐴) ⊆ (1^st ‘𝐵))

Theorem	aptiprlemu 7843	Lemma for aptipr 7844. (Contributed by Jim Kingdon, 28-Jan-2020.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ ¬ 𝐵<_P 𝐴) → (2^nd ‘𝐵) ⊆ (2^nd ‘𝐴))

Theorem	aptipr 7844	Apartness of positive reals is tight. (Contributed by Jim Kingdon, 28-Jan-2020.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ ¬ (𝐴<_P 𝐵 ∨ 𝐵<_P 𝐴)) → 𝐴 = 𝐵)

Theorem	ltmprr 7845	Ordering property of multiplication. (Contributed by Jim Kingdon, 18-Feb-2020.)
⊢ ((𝐴 ∈ P ∧ 𝐵 ∈ P ∧ 𝐶 ∈ P) → ((𝐶 ·_P 𝐴)<_P (𝐶 ·_P 𝐵) → 𝐴<_P 𝐵))

Theorem	archpr 7846*	For any positive real, there is an integer that is greater than it. This is also known as the "archimedean property". The integer 𝑥 is embedded into the reals as described at nnprlu 7756. (Contributed by Jim Kingdon, 22-Apr-2020.)
⊢ (𝐴 ∈ P → ∃𝑥 ∈ N 𝐴<_P ⟨{𝑙 ∣ 𝑙 <_Q [⟨𝑥, 1_o⟩] ~_Q }, {𝑢 ∣ [⟨𝑥, 1_o⟩] ~_Q <_Q 𝑢}⟩)

Theorem	caucvgprlemcanl 7847*	Lemma for cauappcvgprlemladdrl 7860. Cancelling a term from both sides. (Contributed by Jim Kingdon, 15-Aug-2020.)
⊢ (𝜑 → 𝐿 ∈ P) & ⊢ (𝜑 → 𝑆 ∈ Q) & ⊢ (𝜑 → 𝑅 ∈ Q) & ⊢ (𝜑 → 𝑄 ∈ Q) ⇒ ⊢ (𝜑 → ((𝑅 +_Q 𝑄) ∈ (1^st ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q (𝑆 +_Q 𝑄)}, {𝑢 ∣ (𝑆 +_Q 𝑄) <_Q 𝑢}⟩)) ↔ 𝑅 ∈ (1^st ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩))))

Theorem	cauappcvgprlemm 7848*	Lemma for cauappcvgpr 7865. The putative limit is inhabited. (Contributed by Jim Kingdon, 18-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → (∃𝑠 ∈ Q 𝑠 ∈ (1^st ‘𝐿) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2^nd ‘𝐿)))

Theorem	cauappcvgprlemopl 7849*	Lemma for cauappcvgpr 7865. The lower cut of the putative limit is open. (Contributed by Jim Kingdon, 4-Aug-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 ∈ (1^st ‘𝐿)) → ∃𝑟 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿)))

Theorem	cauappcvgprlemlol 7850*	Lemma for cauappcvgpr 7865. The lower cut of the putative limit is lower. (Contributed by Jim Kingdon, 4-Aug-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿)) → 𝑠 ∈ (1^st ‘𝐿))

Theorem	cauappcvgprlemopu 7851*	Lemma for cauappcvgpr 7865. The upper cut of the putative limit is open. (Contributed by Jim Kingdon, 4-Aug-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑟 ∈ (2^nd ‘𝐿)) → ∃𝑠 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)))

Theorem	cauappcvgprlemupu 7852*	Lemma for cauappcvgpr 7865. The upper cut of the putative limit is upper. (Contributed by Jim Kingdon, 4-Aug-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)) → 𝑟 ∈ (2^nd ‘𝐿))

Theorem	cauappcvgprlemrnd 7853*	Lemma for cauappcvgpr 7865. The putative limit is rounded. (Contributed by Jim Kingdon, 18-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → (∀𝑠 ∈ Q (𝑠 ∈ (1^st ‘𝐿) ↔ ∃𝑟 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿))) ∧ ∀𝑟 ∈ Q (𝑟 ∈ (2^nd ‘𝐿) ↔ ∃𝑠 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)))))

Theorem	cauappcvgprlemdisj 7854*	Lemma for cauappcvgpr 7865. The putative limit is disjoint. (Contributed by Jim Kingdon, 18-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑠 ∈ Q ¬ (𝑠 ∈ (1^st ‘𝐿) ∧ 𝑠 ∈ (2^nd ‘𝐿)))

Theorem	cauappcvgprlemloc 7855*	Lemma for cauappcvgpr 7865. The putative limit is located. (Contributed by Jim Kingdon, 18-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑠 ∈ Q ∀𝑟 ∈ Q (𝑠 <_Q 𝑟 → (𝑠 ∈ (1^st ‘𝐿) ∨ 𝑟 ∈ (2^nd ‘𝐿))))

Theorem	cauappcvgprlemcl 7856*	Lemma for cauappcvgpr 7865. The putative limit is a positive real. (Contributed by Jim Kingdon, 20-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → 𝐿 ∈ P)

Theorem	cauappcvgprlemladdfu 7857*	Lemma for cauappcvgprlemladd 7861. The forward subset relationship for the upper cut. (Contributed by Jim Kingdon, 11-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (2^nd ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)) ⊆ (2^nd ‘⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q ((𝐹‘𝑞) +_Q 𝑆)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q (((𝐹‘𝑞) +_Q 𝑞) +_Q 𝑆) <_Q 𝑢}⟩))

Theorem	cauappcvgprlemladdfl 7858*	Lemma for cauappcvgprlemladd 7861. The forward subset relationship for the lower cut. (Contributed by Jim Kingdon, 11-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (1^st ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)) ⊆ (1^st ‘⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q ((𝐹‘𝑞) +_Q 𝑆)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q (((𝐹‘𝑞) +_Q 𝑞) +_Q 𝑆) <_Q 𝑢}⟩))

Theorem	cauappcvgprlemladdru 7859*	Lemma for cauappcvgprlemladd 7861. The reverse subset relationship for the upper cut. (Contributed by Jim Kingdon, 11-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (2^nd ‘⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q ((𝐹‘𝑞) +_Q 𝑆)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q (((𝐹‘𝑞) +_Q 𝑞) +_Q 𝑆) <_Q 𝑢}⟩) ⊆ (2^nd ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)))

Theorem	cauappcvgprlemladdrl 7860*	Lemma for cauappcvgprlemladd 7861. The forward subset relationship for the lower cut. (Contributed by Jim Kingdon, 11-Jul-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (1^st ‘⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q ((𝐹‘𝑞) +_Q 𝑆)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q (((𝐹‘𝑞) +_Q 𝑞) +_Q 𝑆) <_Q 𝑢}⟩) ⊆ (1^st ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)))

Theorem	cauappcvgprlemladd 7861*	Lemma for cauappcvgpr 7865. This takes 𝐿 and offsets it by the positive fraction 𝑆. (Contributed by Jim Kingdon, 23-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩) = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q ((𝐹‘𝑞) +_Q 𝑆)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q (((𝐹‘𝑞) +_Q 𝑞) +_Q 𝑆) <_Q 𝑢}⟩)

Theorem	cauappcvgprlem1 7862*	Lemma for cauappcvgpr 7865. Part of showing the putative limit to be a limit. (Contributed by Jim Kingdon, 23-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑄 ∈ Q) & ⊢ (𝜑 → 𝑅 ∈ Q) ⇒ ⊢ (𝜑 → ⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝑄)}, {𝑢 ∣ (𝐹‘𝑄) <_Q 𝑢}⟩<_P (𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q (𝑄 +_Q 𝑅)}, {𝑢 ∣ (𝑄 +_Q 𝑅) <_Q 𝑢}⟩))

Theorem	cauappcvgprlem2 7863*	Lemma for cauappcvgpr 7865. Part of showing the putative limit to be a limit. (Contributed by Jim Kingdon, 23-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑄 ∈ Q) & ⊢ (𝜑 → 𝑅 ∈ Q) ⇒ ⊢ (𝜑 → 𝐿<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝑄) +_Q (𝑄 +_Q 𝑅))}, {𝑢 ∣ ((𝐹‘𝑄) +_Q (𝑄 +_Q 𝑅)) <_Q 𝑢}⟩)

Theorem	cauappcvgprlemlim 7864*	Lemma for cauappcvgpr 7865. The putative limit is a limit. (Contributed by Jim Kingdon, 20-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑞 ∈ Q (𝑙 +_Q 𝑞) <_Q (𝐹‘𝑞)}, {𝑢 ∈ Q ∣ ∃𝑞 ∈ Q ((𝐹‘𝑞) +_Q 𝑞) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑞 ∈ Q ∀𝑟 ∈ Q (⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝑞)}, {𝑢 ∣ (𝐹‘𝑞) <_Q 𝑢}⟩<_P (𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q (𝑞 +_Q 𝑟)}, {𝑢 ∣ (𝑞 +_Q 𝑟) <_Q 𝑢}⟩) ∧ 𝐿<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝑞) +_Q (𝑞 +_Q 𝑟))}, {𝑢 ∣ ((𝐹‘𝑞) +_Q (𝑞 +_Q 𝑟)) <_Q 𝑢}⟩))

Theorem	cauappcvgpr 7865*	A Cauchy approximation has a limit. A Cauchy approximation, here 𝐹, is similar to a Cauchy sequence but is indexed by the desired tolerance (that is, how close together terms needs to be) rather than by natural numbers. This is basically Theorem 11.2.12 of [HoTT], p. (varies) with a few differences such as that we are proving the existence of a limit without anything about how fast it converges (that is, mere existence instead of existence, in HoTT terms), and that the codomain of 𝐹 is Q rather than P. We also specify that every term needs to be larger than a fraction 𝐴, to avoid the case where we have positive terms which "converge" to zero (which is not a positive real). This proof (including its lemmas) is similar to the proofs of caucvgpr 7885 and caucvgprpr 7915 but is somewhat simpler, so reading this one first may help understanding the other two. (Contributed by Jim Kingdon, 19-Jun-2020.)
⊢ (𝜑 → 𝐹:Q⟶Q) & ⊢ (𝜑 → ∀𝑝 ∈ Q ∀𝑞 ∈ Q ((𝐹‘𝑝) <_Q ((𝐹‘𝑞) +_Q (𝑝 +_Q 𝑞)) ∧ (𝐹‘𝑞) <_Q ((𝐹‘𝑝) +_Q (𝑝 +_Q 𝑞)))) & ⊢ (𝜑 → ∀𝑝 ∈ Q 𝐴 <_Q (𝐹‘𝑝)) ⇒ ⊢ (𝜑 → ∃𝑦 ∈ P ∀𝑞 ∈ Q ∀𝑟 ∈ Q (⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝑞)}, {𝑢 ∣ (𝐹‘𝑞) <_Q 𝑢}⟩<_P (𝑦 +_P ⟨{𝑙 ∣ 𝑙 <_Q (𝑞 +_Q 𝑟)}, {𝑢 ∣ (𝑞 +_Q 𝑟) <_Q 𝑢}⟩) ∧ 𝑦<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝑞) +_Q (𝑞 +_Q 𝑟))}, {𝑢 ∣ ((𝐹‘𝑞) +_Q (𝑞 +_Q 𝑟)) <_Q 𝑢}⟩))

Theorem	archrecnq 7866*	Archimedean principle for fractions (reciprocal version). (Contributed by Jim Kingdon, 27-Sep-2020.)
⊢ (𝐴 ∈ Q → ∃𝑗 ∈ N (*_Q‘[⟨𝑗, 1_o⟩] ~_Q ) <_Q 𝐴)

Theorem	archrecpr 7867*	Archimedean principle for positive reals (reciprocal version). (Contributed by Jim Kingdon, 25-Nov-2020.)
⊢ (𝐴 ∈ P → ∃𝑗 ∈ N ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑗, 1_o⟩] ~_Q ) <_Q 𝑢}⟩<_P 𝐴)

Theorem	caucvgprlemk 7868	Lemma for caucvgpr 7885. Reciprocals of positive integers decrease as the positive integers increase. (Contributed by Jim Kingdon, 9-Oct-2020.)
⊢ (𝜑 → 𝐽 <_N 𝐾) & ⊢ (𝜑 → (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑄) ⇒ ⊢ (𝜑 → (_Q‘[⟨𝐾, 1_o⟩] ~_Q ) <_Q 𝑄)

Theorem	caucvgprlemnkj 7869*	Lemma for caucvgpr 7885. Part of disjointness. (Contributed by Jim Kingdon, 23-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → 𝐾 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → ¬ ((𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )) <_Q (𝐹‘𝐾) ∧ ((𝐹‘𝐽) +_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )) <_Q 𝑆))

Theorem	caucvgprlemnbj 7870*	Lemma for caucvgpr 7885. Non-existence of two elements of the sequence which are too far from each other. (Contributed by Jim Kingdon, 18-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → 𝐵 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) ⇒ ⊢ (𝜑 → ¬ (((𝐹‘𝐵) +_Q (_Q‘[⟨𝐵, 1_o⟩] ~_Q )) +_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )) <_Q (𝐹‘𝐽))

Theorem	caucvgprlemm 7871*	Lemma for caucvgpr 7885. The putative limit is inhabited. (Contributed by Jim Kingdon, 27-Sep-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → (∃𝑠 ∈ Q 𝑠 ∈ (1^st ‘𝐿) ∧ ∃𝑟 ∈ Q 𝑟 ∈ (2^nd ‘𝐿)))

Theorem	caucvgprlemopl 7872*	Lemma for caucvgpr 7885. The lower cut of the putative limit is open. (Contributed by Jim Kingdon, 20-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 ∈ (1^st ‘𝐿)) → ∃𝑟 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿)))

Theorem	caucvgprlemlol 7873*	Lemma for caucvgpr 7885. The lower cut of the putative limit is lower. (Contributed by Jim Kingdon, 20-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿)) → 𝑠 ∈ (1^st ‘𝐿))

Theorem	caucvgprlemopu 7874*	Lemma for caucvgpr 7885. The upper cut of the putative limit is open. (Contributed by Jim Kingdon, 20-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑟 ∈ (2^nd ‘𝐿)) → ∃𝑠 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)))

Theorem	caucvgprlemupu 7875*	Lemma for caucvgpr 7885. The upper cut of the putative limit is upper. (Contributed by Jim Kingdon, 20-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)) → 𝑟 ∈ (2^nd ‘𝐿))

Theorem	caucvgprlemrnd 7876*	Lemma for caucvgpr 7885. The putative limit is rounded. (Contributed by Jim Kingdon, 27-Sep-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → (∀𝑠 ∈ Q (𝑠 ∈ (1^st ‘𝐿) ↔ ∃𝑟 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑟 ∈ (1^st ‘𝐿))) ∧ ∀𝑟 ∈ Q (𝑟 ∈ (2^nd ‘𝐿) ↔ ∃𝑠 ∈ Q (𝑠 <_Q 𝑟 ∧ 𝑠 ∈ (2^nd ‘𝐿)))))

Theorem	caucvgprlemdisj 7877*	Lemma for caucvgpr 7885. The putative limit is disjoint. (Contributed by Jim Kingdon, 27-Sep-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑠 ∈ Q ¬ (𝑠 ∈ (1^st ‘𝐿) ∧ 𝑠 ∈ (2^nd ‘𝐿)))

Theorem	caucvgprlemloc 7878*	Lemma for caucvgpr 7885. The putative limit is located. (Contributed by Jim Kingdon, 27-Sep-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑠 ∈ Q ∀𝑟 ∈ Q (𝑠 <_Q 𝑟 → (𝑠 ∈ (1^st ‘𝐿) ∨ 𝑟 ∈ (2^nd ‘𝐿))))

Theorem	caucvgprlemcl 7879*	Lemma for caucvgpr 7885. The putative limit is a positive real. (Contributed by Jim Kingdon, 26-Sep-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → 𝐿 ∈ P)

Theorem	caucvgprlemladdfu 7880*	Lemma for caucvgpr 7885. Adding 𝑆 after embedding in positive reals, or adding it as a rational. (Contributed by Jim Kingdon, 9-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → (2^nd ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)) ⊆ {𝑢 ∈ Q ∣ ∃𝑗 ∈ N (((𝐹‘𝑗) +_Q (*_Q‘[⟨𝑗, 1_o⟩] ~_Q )) +_Q 𝑆) <_Q 𝑢})

Theorem	caucvgprlemladdrl 7881*	Lemma for caucvgpr 7885. Adding 𝑆 after embedding in positive reals, or adding it as a rational. (Contributed by Jim Kingdon, 8-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → {𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (*_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q ((𝐹‘𝑗) +_Q 𝑆)} ⊆ (1^st ‘(𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑆}, {𝑢 ∣ 𝑆 <_Q 𝑢}⟩)))

Theorem	caucvgprlem1 7882*	Lemma for caucvgpr 7885. Part of showing the putative limit to be a limit. (Contributed by Jim Kingdon, 3-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑄 ∈ Q) & ⊢ (𝜑 → 𝐽 <_N 𝐾) & ⊢ (𝜑 → (*_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑄) ⇒ ⊢ (𝜑 → ⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝐾)}, {𝑢 ∣ (𝐹‘𝐾) <_Q 𝑢}⟩<_P (𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑄}, {𝑢 ∣ 𝑄 <_Q 𝑢}⟩))

Theorem	caucvgprlem2 7883*	Lemma for caucvgpr 7885. Part of showing the putative limit to be a limit. (Contributed by Jim Kingdon, 3-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ & ⊢ (𝜑 → 𝑄 ∈ Q) & ⊢ (𝜑 → 𝐽 <_N 𝐾) & ⊢ (𝜑 → (*_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑄) ⇒ ⊢ (𝜑 → 𝐿<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝐾) +_Q 𝑄)}, {𝑢 ∣ ((𝐹‘𝐾) +_Q 𝑄) <_Q 𝑢}⟩)

Theorem	caucvgprlemlim 7884*	Lemma for caucvgpr 7885. The putative limit is a limit. (Contributed by Jim Kingdon, 1-Oct-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑗 ∈ N (𝑙 +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q (𝐹‘𝑗)}, {𝑢 ∈ Q ∣ ∃𝑗 ∈ N ((𝐹‘𝑗) +_Q (_Q‘[⟨𝑗, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ ⇒ ⊢ (𝜑 → ∀𝑥 ∈ Q ∃𝑗 ∈ N ∀𝑘 ∈ N (𝑗 <_N 𝑘 → (⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝑘)}, {𝑢 ∣ (𝐹‘𝑘) <_Q 𝑢}⟩<_P (𝐿 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑥}, {𝑢 ∣ 𝑥 <_Q 𝑢}⟩) ∧ 𝐿<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝑘) +_Q 𝑥)}, {𝑢 ∣ ((𝐹‘𝑘) +_Q 𝑥) <_Q 𝑢}⟩)))

Theorem	caucvgpr 7885*	A Cauchy sequence of positive fractions with a modulus of convergence converges to a positive real. This is basically Corollary 11.2.13 of [HoTT], p. (varies) (one key difference being that this is for positive reals rather than signed reals). Also, the HoTT book theorem has a modulus of convergence (that is, a rate of convergence) specified by (11.2.9) in HoTT whereas this theorem fixes the rate of convergence to say that all terms after the nth term must be within 1 / 𝑛 of the nth term (it should later be able to prove versions of this theorem with a different fixed rate or a modulus of convergence supplied as a hypothesis). We also specify that every term needs to be larger than a fraction 𝐴, to avoid the case where we have positive terms which "converge" to zero (which is not a positive real). This proof (including its lemmas) is similar to the proofs of cauappcvgpr 7865 and caucvgprpr 7915. Reading cauappcvgpr 7865 first (the simplest of the three) might help understanding the other two. (Contributed by Jim Kingdon, 18-Jun-2020.)
⊢ (𝜑 → 𝐹:N⟶Q) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛) <_Q ((𝐹‘𝑘) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )) ∧ (𝐹‘𝑘) <_Q ((𝐹‘𝑛) +_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q ))))) & ⊢ (𝜑 → ∀𝑗 ∈ N 𝐴 <_Q (𝐹‘𝑗)) ⇒ ⊢ (𝜑 → ∃𝑦 ∈ P ∀𝑥 ∈ Q ∃𝑗 ∈ N ∀𝑘 ∈ N (𝑗 <_N 𝑘 → (⟨{𝑙 ∣ 𝑙 <_Q (𝐹‘𝑘)}, {𝑢 ∣ (𝐹‘𝑘) <_Q 𝑢}⟩<_P (𝑦 +_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑥}, {𝑢 ∣ 𝑥 <_Q 𝑢}⟩) ∧ 𝑦<_P ⟨{𝑙 ∣ 𝑙 <_Q ((𝐹‘𝑘) +_Q 𝑥)}, {𝑢 ∣ ((𝐹‘𝑘) +_Q 𝑥) <_Q 𝑢}⟩)))

Theorem	caucvgprprlemk 7886*	Lemma for caucvgprpr 7915. Reciprocals of positive integers decrease as the positive integers increase. (Contributed by Jim Kingdon, 28-Nov-2020.)
⊢ (𝜑 → 𝐽 <_N 𝐾) & ⊢ (𝜑 → ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑢}⟩<_P 𝑄) ⇒ ⊢ (𝜑 → ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝐾, 1_o⟩] ~_Q ) <_Q 𝑢}⟩<_P 𝑄)

Theorem	caucvgprprlemloccalc 7887*	Lemma for caucvgprpr 7915. Rearranging some expressions for caucvgprprlemloc 7906. (Contributed by Jim Kingdon, 8-Feb-2021.)
⊢ (𝜑 → 𝑆 <_Q 𝑇) & ⊢ (𝜑 → 𝑌 ∈ Q) & ⊢ (𝜑 → (𝑆 +_Q 𝑌) = 𝑇) & ⊢ (𝜑 → 𝑋 ∈ Q) & ⊢ (𝜑 → (𝑋 +_Q 𝑋) <_Q 𝑌) & ⊢ (𝜑 → 𝑀 ∈ N) & ⊢ (𝜑 → (_Q‘[⟨𝑀, 1_o⟩] ~_Q ) <_Q 𝑋) ⇒ ⊢ (𝜑 → (⟨{𝑙 ∣ 𝑙 <_Q (𝑆 +_Q (_Q‘[⟨𝑀, 1_o⟩] ~_Q ))}, {𝑢 ∣ (𝑆 +_Q (_Q‘[⟨𝑀, 1_o⟩] ~_Q )) <_Q 𝑢}⟩ +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑀, 1_o⟩] ~_Q )}, {𝑢 ∣ (*_Q‘[⟨𝑀, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)<_P ⟨{𝑙 ∣ 𝑙 <_Q 𝑇}, {𝑢 ∣ 𝑇 <_Q 𝑢}⟩)

Theorem	caucvgprprlemell 7888*	Lemma for caucvgprpr 7915. Membership in the lower cut of the putative limit. (Contributed by Jim Kingdon, 21-Jan-2021.)
⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ (𝑋 ∈ (1^st ‘𝐿) ↔ (𝑋 ∈ Q ∧ ∃𝑏 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑋 +_Q (_Q‘[⟨𝑏, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑋 +_Q (_Q‘[⟨𝑏, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑏)))

Theorem	caucvgprprlemelu 7889*	Lemma for caucvgprpr 7915. Membership in the upper cut of the putative limit. (Contributed by Jim Kingdon, 28-Jan-2021.)
⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ (𝑋 ∈ (2^nd ‘𝐿) ↔ (𝑋 ∈ Q ∧ ∃𝑏 ∈ N ((𝐹‘𝑏) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑏, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑏, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑋}, {𝑞 ∣ 𝑋 <_Q 𝑞}⟩))

Theorem	caucvgprprlemcbv 7890*	Lemma for caucvgprpr 7915. Change bound variables in Cauchy condition. (Contributed by Jim Kingdon, 12-Feb-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) ⇒ ⊢ (𝜑 → ∀𝑎 ∈ N ∀𝑏 ∈ N (𝑎 <_N 𝑏 → ((𝐹‘𝑎)<_P ((𝐹‘𝑏) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑎, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑎, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑏)<_P ((𝐹‘𝑎) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑎, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑎, 1_o⟩] ~_Q ) <_Q 𝑢}⟩))))

Theorem	caucvgprprlemval 7891*	Lemma for caucvgprpr 7915. Cauchy condition expressed in terms of classes. (Contributed by Jim Kingdon, 3-Mar-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) ⇒ ⊢ ((𝜑 ∧ 𝐴 <_N 𝐵) → ((𝐹‘𝐴)<_P ((𝐹‘𝐵) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐴, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐴, 1_o⟩] ~_Q ) <_Q 𝑞}⟩) ∧ (𝐹‘𝐵)<_P ((𝐹‘𝐴) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐴, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐴, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)))

Theorem	caucvgprprlemnkltj 7892*	Lemma for caucvgprpr 7915. Part of disjointness. (Contributed by Jim Kingdon, 12-Feb-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → 𝐾 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ ((𝜑 ∧ 𝐾 <_N 𝐽) → ¬ (⟨{𝑝 ∣ 𝑝 <_Q (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝐾) ∧ ((𝐹‘𝐽) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑆}, {𝑞 ∣ 𝑆 <_Q 𝑞}⟩))

Theorem	caucvgprprlemnkeqj 7893*	Lemma for caucvgprpr 7915. Part of disjointness. (Contributed by Jim Kingdon, 12-Feb-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → 𝐾 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ ((𝜑 ∧ 𝐾 = 𝐽) → ¬ (⟨{𝑝 ∣ 𝑝 <_Q (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝐾) ∧ ((𝐹‘𝐽) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑆}, {𝑞 ∣ 𝑆 <_Q 𝑞}⟩))

Theorem	caucvgprprlemnjltk 7894*	Lemma for caucvgprpr 7915. Part of disjointness. (Contributed by Jim Kingdon, 12-Feb-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → 𝐾 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ ((𝜑 ∧ 𝐽 <_N 𝐾) → ¬ (⟨{𝑝 ∣ 𝑝 <_Q (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝐾) ∧ ((𝐹‘𝐽) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑆}, {𝑞 ∣ 𝑆 <_Q 𝑞}⟩))

Theorem	caucvgprprlemnkj 7895*	Lemma for caucvgprpr 7915. Part of disjointness. (Contributed by Jim Kingdon, 20-Jan-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → 𝐾 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) & ⊢ (𝜑 → 𝑆 ∈ Q) ⇒ ⊢ (𝜑 → ¬ (⟨{𝑝 ∣ 𝑝 <_Q (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑆 +_Q (_Q‘[⟨𝐾, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝐾) ∧ ((𝐹‘𝐽) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑆}, {𝑞 ∣ 𝑆 <_Q 𝑞}⟩))

Theorem	caucvgprprlemnbj 7896*	Lemma for caucvgprpr 7915. Non-existence of two elements of the sequence which are too far from each other. (Contributed by Jim Kingdon, 17-Jun-2021.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → 𝐵 ∈ N) & ⊢ (𝜑 → 𝐽 ∈ N) ⇒ ⊢ (𝜑 → ¬ (((𝐹‘𝐵) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝐵, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝐵, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝐽, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝐽, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)<_P (𝐹‘𝐽))

Theorem	caucvgprprlemml 7897*	Lemma for caucvgprpr 7915. The lower cut of the putative limit is inhabited. (Contributed by Jim Kingdon, 29-Dec-2020.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → ∀𝑚 ∈ N 𝐴<_P (𝐹‘𝑚)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ (𝜑 → ∃𝑠 ∈ Q 𝑠 ∈ (1^st ‘𝐿))

Theorem	caucvgprprlemmu 7898*	Lemma for caucvgprpr 7915. The upper cut of the putative limit is inhabited. (Contributed by Jim Kingdon, 29-Dec-2020.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → ∀𝑚 ∈ N 𝐴<_P (𝐹‘𝑚)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ (𝜑 → ∃𝑡 ∈ Q 𝑡 ∈ (2^nd ‘𝐿))

Theorem	caucvgprprlemm 7899*	Lemma for caucvgprpr 7915. The putative limit is inhabited. (Contributed by Jim Kingdon, 21-Dec-2020.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → ∀𝑚 ∈ N 𝐴<_P (𝐹‘𝑚)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ (𝜑 → (∃𝑠 ∈ Q 𝑠 ∈ (1^st ‘𝐿) ∧ ∃𝑡 ∈ Q 𝑡 ∈ (2^nd ‘𝐿)))

Theorem	caucvgprprlemopl 7900*	Lemma for caucvgprpr 7915. The lower cut of the putative limit is open. (Contributed by Jim Kingdon, 21-Dec-2020.)
⊢ (𝜑 → 𝐹:N⟶P) & ⊢ (𝜑 → ∀𝑛 ∈ N ∀𝑘 ∈ N (𝑛 <_N 𝑘 → ((𝐹‘𝑛)<_P ((𝐹‘𝑘) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩) ∧ (𝐹‘𝑘)<_P ((𝐹‘𝑛) +_P ⟨{𝑙 ∣ 𝑙 <_Q (_Q‘[⟨𝑛, 1_o⟩] ~_Q )}, {𝑢 ∣ (_Q‘[⟨𝑛, 1_o⟩] ~_Q ) <_Q 𝑢}⟩)))) & ⊢ (𝜑 → ∀𝑚 ∈ N 𝐴<_P (𝐹‘𝑚)) & ⊢ 𝐿 = ⟨{𝑙 ∈ Q ∣ ∃𝑟 ∈ N ⟨{𝑝 ∣ 𝑝 <_Q (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q ))}, {𝑞 ∣ (𝑙 +_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )) <_Q 𝑞}⟩<_P (𝐹‘𝑟)}, {𝑢 ∈ Q ∣ ∃𝑟 ∈ N ((𝐹‘𝑟) +_P ⟨{𝑝 ∣ 𝑝 <_Q (_Q‘[⟨𝑟, 1_o⟩] ~_Q )}, {𝑞 ∣ (_Q‘[⟨𝑟, 1_o⟩] ~_Q ) <_Q 𝑞}⟩)<_P ⟨{𝑝 ∣ 𝑝 <_Q 𝑢}, {𝑞 ∣ 𝑢 <_Q 𝑞}⟩}⟩ ⇒ ⊢ ((𝜑 ∧ 𝑠 ∈ (1^st ‘𝐿)) → ∃𝑡 ∈ Q (𝑠 <_Q 𝑡 ∧ 𝑡 ∈ (1^st ‘𝐿)))

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