Theorem iscnrm3lem7 47220

Description: Lemma for iscnrm3rlem8 47228 and iscnrm3llem2 47231 involving restricted existential quantifications. (Contributed by Zhi Wang, 5-Sep-2024.)

Hypotheses

Ref	Expression
iscnrm3lem7.1	⊢ (𝑧 = 𝑍 → (𝜒 ↔ 𝜃))
iscnrm3lem7.2	⊢ (𝑤 = 𝑊 → (𝜃 ↔ 𝜏))
iscnrm3lem7.3	⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐵) ∧ 𝜓) → (𝑍 ∈ 𝐶 ∧ 𝑊 ∈ 𝐷 ∧ 𝜏))

Assertion

Ref	Expression
iscnrm3lem7	⊢ (𝜑 → (∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧 ∈ 𝐶 ∃𝑤 ∈ 𝐷 𝜒))

Distinct variable groups:   𝑦,𝐴   𝑥,𝐶,𝑦,𝑧   𝑤,𝐷,𝑥,𝑦,𝑧   𝑤,𝑊   𝑤,𝑍,𝑧   𝜒,𝑥,𝑦   𝜑,𝑥,𝑦   𝜏,𝑤   𝜃,𝑧

Allowed substitution hints:   𝜑(𝑧,𝑤)   𝜓(𝑥,𝑦,𝑧,𝑤)   𝜒(𝑧,𝑤)   𝜃(𝑥,𝑦,𝑤)   𝜏(𝑥,𝑦,𝑧)   𝐴(𝑥,𝑧,𝑤)   𝐵(𝑥,𝑦,𝑧,𝑤)   𝐶(𝑤)   𝑊(𝑥,𝑦,𝑧)   𝑍(𝑥,𝑦)

Proof of Theorem iscnrm3lem7

Step	Hyp	Ref	Expression
1		iscnrm3lem7.3	. . 3 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐵) ∧ 𝜓) → (𝑍 ∈ 𝐶 ∧ 𝑊 ∈ 𝐷 ∧ 𝜏))
2		iscnrm3lem7.1	. . . 4 ⊢ (𝑧 = 𝑍 → (𝜒 ↔ 𝜃))
3		iscnrm3lem7.2	. . . 4 ⊢ (𝑤 = 𝑊 → (𝜃 ↔ 𝜏))
4	2, 3	rspc2ev 3620	. . 3 ⊢ ((𝑍 ∈ 𝐶 ∧ 𝑊 ∈ 𝐷 ∧ 𝜏) → ∃𝑧 ∈ 𝐶 ∃𝑤 ∈ 𝐷 𝜒)
5	1, 4	syl 17	. 2 ⊢ ((𝜑 ∧ (𝑥 ∈ 𝐴 ∧ 𝑦 ∈ 𝐵) ∧ 𝜓) → ∃𝑧 ∈ 𝐶 ∃𝑤 ∈ 𝐷 𝜒)
6	5	iscnrm3lem6 47219	1 ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 ∃𝑦 ∈ 𝐵 𝜓 → ∃𝑧 ∈ 𝐶 ∃𝑤 ∈ 𝐷 𝜒))

Syntax hints:   → wi 4   ↔ wb 205   ∧ wa 396   ∧ w3a 1087   = wceq 1541   ∈ wcel 2106  ∃wrex 3069

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1797  ax-4 1811  ax-5 1913  ax-6 1971  ax-7 2011  ax-8 2108  ax-9 2116  ax-ext 2702

This theorem depends on definitions:  df-bi 206  df-an 397  df-3an 1089  df-tru 1544  df-ex 1782  df-sb 2068  df-clab 2709  df-cleq 2723  df-clel 2809  df-ral 3061  df-rex 3070

This theorem is referenced by:  iscnrm3rlem8  47228  iscnrm3llem2  47231