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Theorem legov2 27817

Description: An equivalent definition of the less-than relationship. Definition 5.5 of [Schwabhauser] p. 41. (Contributed by Thierry Arnoux, 21-Jun-2019.)

**Hypotheses**
Ref	Expression
legval.p	⊢ 𝑃 = (Base‘𝐺)
legval.d	⊢ − = (dist‘𝐺)
legval.i	⊢ 𝐼 = (Itv‘𝐺)
legval.l	⊢ ≤ = (≤G‘𝐺)
legval.g	⊢ (𝜑 → 𝐺 ∈ TarskiG)
legov.a	⊢ (𝜑 → 𝐴 ∈ 𝑃)
legov.b	⊢ (𝜑 → 𝐵 ∈ 𝑃)
legov.c	⊢ (𝜑 → 𝐶 ∈ 𝑃)
legov.d	⊢ (𝜑 → 𝐷 ∈ 𝑃)

**Assertion**
Ref	Expression
legov2	⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))))

Distinct variable groups: 𝑥, − 𝑥,𝐴 𝑥,𝐵 𝑥,𝐶 𝑥,𝐷 𝑥,𝐼 𝑥,𝑃 𝑥,𝐺 𝜑,𝑥 Allowed substitution hint: ≤ (𝑥)

Proof of Theorem legov2 Dummy variables 𝑦 𝑧 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		legval.p	. . 3 ⊢ 𝑃 = (Base‘𝐺)
2		legval.d	. . 3 ⊢ − = (dist‘𝐺)
3		legval.i	. . 3 ⊢ 𝐼 = (Itv‘𝐺)
4		legval.l	. . 3 ⊢ ≤ = (≤G‘𝐺)
5		legval.g	. . 3 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
6		legov.a	. . 3 ⊢ (𝜑 → 𝐴 ∈ 𝑃)
7		legov.b	. . 3 ⊢ (𝜑 → 𝐵 ∈ 𝑃)
8		legov.c	. . 3 ⊢ (𝜑 → 𝐶 ∈ 𝑃)
9		legov.d	. . 3 ⊢ (𝜑 → 𝐷 ∈ 𝑃)
10	1, 2, 3, 4, 5, 6, 7, 8, 9	legov 27816	. 2 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))))
11		eqid 2733	. . . . . . 7 ⊢ (LineG‘𝐺) = (LineG‘𝐺)
12	5	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐺 ∈ TarskiG)
13	8	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐶 ∈ 𝑃)
14		simplr 768	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝑧 ∈ 𝑃)
15	9	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐷 ∈ 𝑃)
16		eqid 2733	. . . . . . 7 ⊢ (cgrG‘𝐺) = (cgrG‘𝐺)
17	6	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐴 ∈ 𝑃)
18	7	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐵 ∈ 𝑃)
19		simprl 770	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝑧 ∈ (𝐶𝐼𝐷))
20	1, 11, 3, 12, 13, 15, 14, 19	btwncolg1 27786	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → (𝑧 ∈ (𝐶(LineG‘𝐺)𝐷) ∨ 𝐶 = 𝐷))
21		simprr 772	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → (𝐴 − 𝐵) = (𝐶 − 𝑧))
22	21	eqcomd 2739	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → (𝐶 − 𝑧) = (𝐴 − 𝐵))
23	1, 11, 3, 12, 13, 14, 15, 16, 17, 18, 2, 20, 22	lnext 27798	. . . . . 6 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → ∃𝑥 ∈ 𝑃 ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩)
24	12	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐺 ∈ TarskiG)
25	13	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐶 ∈ 𝑃)
26	14	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝑧 ∈ 𝑃)
27	15	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐷 ∈ 𝑃)
28	17	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐴 ∈ 𝑃)
29	18	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐵 ∈ 𝑃)
30		simplr 768	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝑥 ∈ 𝑃)
31		simpr 486	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩)
32		simpllr 775	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
33	32	simpld 496	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝑧 ∈ (𝐶𝐼𝐷))
34	1, 2, 3, 16, 24, 25, 26, 27, 28, 29, 30, 31, 33	tgbtwnxfr 27761	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → 𝐵 ∈ (𝐴𝐼𝑥))
35	1, 2, 3, 16, 24, 25, 26, 27, 28, 29, 30, 31	trgcgrcom 27759	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → ⟨“𝐴𝐵𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝑧𝐷”⟩)
36	1, 2, 3, 16, 24, 28, 29, 30, 25, 26, 27, 35	cgr3simp3 27753	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → (𝑥 − 𝐴) = (𝐷 − 𝐶))
37	1, 2, 3, 24, 30, 28, 27, 25, 36	tgcgrcomlr 27711	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → (𝐴 − 𝑥) = (𝐶 − 𝐷))
38	34, 37	jca 513	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩) → (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)))
39	38	ex 414	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ∧ 𝑥 ∈ 𝑃) → (⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩ → (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))))
40	39	reximdva 3169	. . . . . 6 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → (∃𝑥 ∈ 𝑃 ⟨“𝐶𝑧𝐷”⟩(cgrG‘𝐺)⟨“𝐴𝐵𝑥”⟩ → ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))))
41	23, 40	mpd 15	. . . . 5 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)))
42	41	adantllr 718	. . . 4 ⊢ ((((𝜑 ∧ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)))
43		simpr 486	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))) → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)))
44		eleq1 2822	. . . . . . 7 ⊢ (𝑦 = 𝑧 → (𝑦 ∈ (𝐶𝐼𝐷) ↔ 𝑧 ∈ (𝐶𝐼𝐷)))
45		oveq2 7412	. . . . . . . 8 ⊢ (𝑦 = 𝑧 → (𝐶 − 𝑦) = (𝐶 − 𝑧))
46	45	eqeq2d 2744	. . . . . . 7 ⊢ (𝑦 = 𝑧 → ((𝐴 − 𝐵) = (𝐶 − 𝑦) ↔ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
47	44, 46	anbi12d 632	. . . . . 6 ⊢ (𝑦 = 𝑧 → ((𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)) ↔ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
48	47	cbvrexvw 3236	. . . . 5 ⊢ (∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
49	43, 48	sylib 217	. . . 4 ⊢ ((𝜑 ∧ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
50	42, 49	r19.29a 3163	. . 3 ⊢ ((𝜑 ∧ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))) → ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)))
51	5	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐺 ∈ TarskiG)
52	6	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐴 ∈ 𝑃)
53		simplr 768	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝑧 ∈ 𝑃)
54	7	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐵 ∈ 𝑃)
55	8	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐶 ∈ 𝑃)
56	9	ad2antrr 725	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐷 ∈ 𝑃)
57		simprl 770	. . . . . . . 8 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → 𝐵 ∈ (𝐴𝐼𝑧))
58	1, 11, 3, 51, 52, 54, 53, 57	btwncolg3 27788	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → (𝑧 ∈ (𝐴(LineG‘𝐺)𝐵) ∨ 𝐴 = 𝐵))
59		simprr 772	. . . . . . 7 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → (𝐴 − 𝑧) = (𝐶 − 𝐷))
60	1, 11, 3, 51, 52, 53, 54, 16, 55, 56, 2, 58, 59	lnext 27798	. . . . . 6 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → ∃𝑦 ∈ 𝑃 ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩)
61	51	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐺 ∈ TarskiG)
62	52	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐴 ∈ 𝑃)
63	54	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐵 ∈ 𝑃)
64	53	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝑧 ∈ 𝑃)
65	55	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐶 ∈ 𝑃)
66		simplr 768	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝑦 ∈ 𝑃)
67	56	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐷 ∈ 𝑃)
68		simpr 486	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩)
69	1, 2, 3, 16, 61, 62, 64, 63, 65, 67, 66, 68	cgr3swap23 27755	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → ⟨“𝐴𝐵𝑧”⟩(cgrG‘𝐺)⟨“𝐶𝑦𝐷”⟩)
70		simpllr 775	. . . . . . . . . . 11 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷)))
71	70	simpld 496	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝐵 ∈ (𝐴𝐼𝑧))
72	1, 2, 3, 16, 61, 62, 63, 64, 65, 66, 67, 69, 71	tgbtwnxfr 27761	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → 𝑦 ∈ (𝐶𝐼𝐷))
73	1, 2, 3, 16, 61, 62, 64, 63, 65, 67, 66, 68	cgr3simp3 27753	. . . . . . . . . 10 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → (𝐵 − 𝐴) = (𝑦 − 𝐶))
74	1, 2, 3, 61, 63, 62, 66, 65, 73	tgcgrcomlr 27711	. . . . . . . . 9 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → (𝐴 − 𝐵) = (𝐶 − 𝑦))
75	72, 74	jca 513	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) ∧ ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩) → (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)))
76	75	ex 414	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) ∧ 𝑦 ∈ 𝑃) → (⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩ → (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))))
77	76	reximdva 3169	. . . . . 6 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → (∃𝑦 ∈ 𝑃 ⟨“𝐴𝑧𝐵”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑦”⟩ → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦))))
78	60, 77	mpd 15	. . . . 5 ⊢ (((𝜑 ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)))
79	78	adantllr 718	. . . 4 ⊢ ((((𝜑 ∧ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))) ∧ 𝑧 ∈ 𝑃) ∧ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))) → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)))
80		simpr 486	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))) → ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)))
81		oveq2 7412	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → (𝐴𝐼𝑥) = (𝐴𝐼𝑧))
82	81	eleq2d 2820	. . . . . . 7 ⊢ (𝑥 = 𝑧 → (𝐵 ∈ (𝐴𝐼𝑥) ↔ 𝐵 ∈ (𝐴𝐼𝑧)))
83		oveq2 7412	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → (𝐴 − 𝑥) = (𝐴 − 𝑧))
84	83	eqeq1d 2735	. . . . . . 7 ⊢ (𝑥 = 𝑧 → ((𝐴 − 𝑥) = (𝐶 − 𝐷) ↔ (𝐴 − 𝑧) = (𝐶 − 𝐷)))
85	82, 84	anbi12d 632	. . . . . 6 ⊢ (𝑥 = 𝑧 → ((𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)) ↔ (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷))))
86	85	cbvrexvw 3236	. . . . 5 ⊢ (∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷)) ↔ ∃𝑧 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷)))
87	80, 86	sylib 217	. . . 4 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))) → ∃𝑧 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑧) ∧ (𝐴 − 𝑧) = (𝐶 − 𝐷)))
88	79, 87	r19.29a 3163	. . 3 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))) → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)))
89	50, 88	impbida 800	. 2 ⊢ (𝜑 → (∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑦)) ↔ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))))
90	10, 89	bitrd 279	1 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑥 ∈ 𝑃 (𝐵 ∈ (𝐴𝐼𝑥) ∧ (𝐴 − 𝑥) = (𝐶 − 𝐷))))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ↔ wb 205 ∧ wa 397 = wceq 1542 ∈ wcel 2107 ∃wrex 3071 class class class wbr 5147 ‘cfv 6540 (class class class)co 7404 ⟨“cs3 14789 Basecbs 17140 distcds 17202 TarskiGcstrkg 27658 Itvcitv 27664 LineGclng 27665 cgrGccgrg 27741 ≤Gcleg 27813

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2109 ax-9 2117 ax-10 2138 ax-11 2155 ax-12 2172 ax-ext 2704 ax-rep 5284 ax-sep 5298 ax-nul 5305 ax-pow 5362 ax-pr 5426 ax-un 7720 ax-cnex 11162 ax-resscn 11163 ax-1cn 11164 ax-icn 11165 ax-addcl 11166 ax-addrcl 11167 ax-mulcl 11168 ax-mulrcl 11169 ax-mulcom 11170 ax-addass 11171 ax-mulass 11172 ax-distr 11173 ax-i2m1 11174 ax-1ne0 11175 ax-1rid 11176 ax-rnegex 11177 ax-rrecex 11178 ax-cnre 11179 ax-pre-lttri 11180 ax-pre-lttrn 11181 ax-pre-ltadd 11182 ax-pre-mulgt0 11183

This theorem depends on definitions: df-bi 206 df-an 398 df-or 847 df-3or 1089 df-3an 1090 df-tru 1545 df-fal 1555 df-ex 1783 df-nf 1787 df-sb 2069 df-mo 2535 df-eu 2564 df-clab 2711 df-cleq 2725 df-clel 2811 df-nfc 2886 df-ne 2942 df-nel 3048 df-ral 3063 df-rex 3072 df-reu 3378 df-rab 3434 df-v 3477 df-sbc 3777 df-csb 3893 df-dif 3950 df-un 3952 df-in 3954 df-ss 3964 df-pss 3966 df-nul 4322 df-if 4528 df-pw 4603 df-sn 4628 df-pr 4630 df-tp 4632 df-op 4634 df-uni 4908 df-int 4950 df-iun 4998 df-br 5148 df-opab 5210 df-mpt 5231 df-tr 5265 df-id 5573 df-eprel 5579 df-po 5587 df-so 5588 df-fr 5630 df-we 5632 df-xp 5681 df-rel 5682 df-cnv 5683 df-co 5684 df-dm 5685 df-rn 5686 df-res 5687 df-ima 5688 df-pred 6297 df-ord 6364 df-on 6365 df-lim 6366 df-suc 6367 df-iota 6492 df-fun 6542 df-fn 6543 df-f 6544 df-f1 6545 df-fo 6546 df-f1o 6547 df-fv 6548 df-riota 7360 df-ov 7407 df-oprab 7408 df-mpo 7409 df-om 7851 df-1st 7970 df-2nd 7971 df-frecs 8261 df-wrecs 8292 df-recs 8366 df-rdg 8405 df-1o 8461 df-oadd 8465 df-er 8699 df-pm 8819 df-en 8936 df-dom 8937 df-sdom 8938 df-fin 8939 df-dju 9892 df-card 9930 df-pnf 11246 df-mnf 11247 df-xr 11248 df-ltxr 11249 df-le 11250 df-sub 11442 df-neg 11443 df-nn 12209 df-2 12271 df-3 12272 df-n0 12469 df-xnn0 12541 df-z 12555 df-uz 12819 df-fz 13481 df-fzo 13624 df-hash 14287 df-word 14461 df-concat 14517 df-s1 14542 df-s2 14795 df-s3 14796 df-trkgc 27679 df-trkgb 27680 df-trkgcb 27681 df-trkg 27684 df-cgrg 27742 df-leg 27814

This theorem is referenced by: legtri3 27821 legtrid 27822

W3C validator