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Theorem legov 27816

Description: Value of the less-than relationship. Definition 5.4 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
legov	⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))

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

Proof of Theorem legov Dummy variables 𝑐 𝑑 𝑒 𝑓 𝑥 𝑦 are mutually distinct and distinct from all other variables.

Step	Hyp	Ref	Expression
1		legval.p	. . . . 5 ⊢ 𝑃 = (Base‘𝐺)
2		legval.d	. . . . 5 ⊢ − = (dist‘𝐺)
3		legval.i	. . . . 5 ⊢ 𝐼 = (Itv‘𝐺)
4		legval.l	. . . . 5 ⊢ ≤ = (≤G‘𝐺)
5		legval.g	. . . . 5 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
6	1, 2, 3, 4, 5	legval 27815	. . . 4 ⊢ (𝜑 → ≤ = {⟨𝑒, 𝑓⟩ ∣ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)))})
7	6	breqd 5158	. . 3 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ (𝐴 − 𝐵){⟨𝑒, 𝑓⟩ ∣ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)))} (𝐶 − 𝐷)))
8		ovex 7437	. . . 4 ⊢ (𝐴 − 𝐵) ∈ V
9		ovex 7437	. . . 4 ⊢ (𝐶 − 𝐷) ∈ V
10		simpr 486	. . . . . . 7 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → 𝑓 = (𝐶 − 𝐷))
11	10	eqeq1d 2735	. . . . . 6 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → (𝑓 = (𝑥 − 𝑦) ↔ (𝐶 − 𝐷) = (𝑥 − 𝑦)))
12		simpl 484	. . . . . . . . 9 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → 𝑒 = (𝐴 − 𝐵))
13	12	eqeq1d 2735	. . . . . . . 8 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → (𝑒 = (𝑥 − 𝑧) ↔ (𝐴 − 𝐵) = (𝑥 − 𝑧)))
14	13	anbi2d 630	. . . . . . 7 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → ((𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)) ↔ (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
15	14	rexbidv 3179	. . . . . 6 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → (∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
16	11, 15	anbi12d 632	. . . . 5 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → ((𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧))) ↔ ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))))
17	16	2rexbidv 3220	. . . 4 ⊢ ((𝑒 = (𝐴 − 𝐵) ∧ 𝑓 = (𝐶 − 𝐷)) → (∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧))) ↔ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))))
18		eqid 2733	. . . 4 ⊢ {⟨𝑒, 𝑓⟩ ∣ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)))} = {⟨𝑒, 𝑓⟩ ∣ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)))}
19	8, 9, 17, 18	braba 5536	. . 3 ⊢ ((𝐴 − 𝐵){⟨𝑒, 𝑓⟩ ∣ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 (𝑓 = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ 𝑒 = (𝑥 − 𝑧)))} (𝐶 − 𝐷) ↔ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
20	7, 19	bitrdi 287	. 2 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))))
21		anass 470	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))) ↔ (((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))))
22	21	anbi1i 625	. . . . . . 7 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ↔ ((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) ∧ 𝑥 ∈ 𝑃))
23		eqid 2733	. . . . . . . . . . 11 ⊢ (cgrG‘𝐺) = (cgrG‘𝐺)
24	5	ad5antr 733	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝐺 ∈ TarskiG)
25	24	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝐺 ∈ TarskiG)
26		simp-5r 785	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝑐 ∈ 𝑃)
27	26	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑐 ∈ 𝑃)
28		simpllr 775	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑥 ∈ 𝑃)
29		simp-4r 783	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝑑 ∈ 𝑃)
30	29	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑑 ∈ 𝑃)
31		legov.c	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐶 ∈ 𝑃)
32	31	ad5antr 733	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝐶 ∈ 𝑃)
33	32	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝐶 ∈ 𝑃)
34		simprl 770	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑧 ∈ 𝑃)
35		legov.d	. . . . . . . . . . . . 13 ⊢ (𝜑 → 𝐷 ∈ 𝑃)
36	35	ad5antr 733	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝐷 ∈ 𝑃)
37	36	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝐷 ∈ 𝑃)
38		simprr 772	. . . . . . . . . . . 12 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)
39	1, 2, 3, 23, 25, 27, 30, 28, 33, 37, 34, 38	cgr3swap23 27755	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → ⟨“𝑐𝑥𝑑”⟩(cgrG‘𝐺)⟨“𝐶𝑧𝐷”⟩)
40		simprl 770	. . . . . . . . . . . 12 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝑥 ∈ (𝑐𝐼𝑑))
41	40	adantr 482	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑥 ∈ (𝑐𝐼𝑑))
42	1, 2, 3, 23, 25, 27, 28, 30, 33, 34, 37, 39, 41	tgbtwnxfr 27761	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → 𝑧 ∈ (𝐶𝐼𝐷))
43		simplrr 777	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → (𝐴 − 𝐵) = (𝑐 − 𝑥))
44	1, 2, 3, 23, 25, 27, 28, 30, 33, 34, 37, 39	cgr3simp1 27751	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → (𝑐 − 𝑥) = (𝐶 − 𝑧))
45	43, 44	eqtrd 2773	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → (𝐴 − 𝐵) = (𝐶 − 𝑧))
46	42, 45	jca 513	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) ∧ (𝑧 ∈ 𝑃 ∧ ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)) → (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
47		eqid 2733	. . . . . . . . . 10 ⊢ (LineG‘𝐺) = (LineG‘𝐺)
48		simplr 768	. . . . . . . . . 10 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → 𝑥 ∈ 𝑃)
49	1, 47, 3, 24, 26, 48, 29, 40	btwncolg3 27788	. . . . . . . . . 10 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → (𝑑 ∈ (𝑐(LineG‘𝐺)𝑥) ∨ 𝑐 = 𝑥))
50		simpllr 775	. . . . . . . . . . 11 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → (𝐶 − 𝐷) = (𝑐 − 𝑑))
51	50	eqcomd 2739	. . . . . . . . . 10 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → (𝑐 − 𝑑) = (𝐶 − 𝐷))
52	1, 47, 3, 24, 26, 29, 48, 23, 32, 36, 2, 49, 51	lnext 27798	. . . . . . . . 9 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → ∃𝑧 ∈ 𝑃 ⟨“𝑐𝑑𝑥”⟩(cgrG‘𝐺)⟨“𝐶𝐷𝑧”⟩)
53	46, 52	reximddv 3172	. . . . . . . 8 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
54	53	adantllr 718	. . . . . . 7 ⊢ (((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ (𝐶 − 𝐷) = (𝑐 − 𝑑)) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
55	22, 54	sylanbr 583	. . . . . 6 ⊢ ((((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
56		simprr 772	. . . . . . 7 ⊢ ((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))
57		eleq1w 2817	. . . . . . . . 9 ⊢ (𝑥 = 𝑧 → (𝑥 ∈ (𝑐𝐼𝑑) ↔ 𝑧 ∈ (𝑐𝐼𝑑)))
58		oveq2 7412	. . . . . . . . . 10 ⊢ (𝑥 = 𝑧 → (𝑐 − 𝑥) = (𝑐 − 𝑧))
59	58	eqeq2d 2744	. . . . . . . . 9 ⊢ (𝑥 = 𝑧 → ((𝐴 − 𝐵) = (𝑐 − 𝑥) ↔ (𝐴 − 𝐵) = (𝑐 − 𝑧)))
60	57, 59	anbi12d 632	. . . . . . . 8 ⊢ (𝑥 = 𝑧 → ((𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥)) ↔ (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))))
61	60	cbvrexvw 3236	. . . . . . 7 ⊢ (∃𝑥 ∈ 𝑃 (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))
62	56, 61	sylibr 233	. . . . . 6 ⊢ ((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) → ∃𝑥 ∈ 𝑃 (𝑥 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑥)))
63	55, 62	r19.29a 3163	. . . . 5 ⊢ ((((𝜑 ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
64	63	adantl3r 749	. . . 4 ⊢ (((((𝜑 ∧ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))) ∧ 𝑐 ∈ 𝑃) ∧ 𝑑 ∈ 𝑃) ∧ ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
65		simpr 486	. . . . 5 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))) → ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
66		oveq1 7411	. . . . . . . 8 ⊢ (𝑐 = 𝑥 → (𝑐 − 𝑑) = (𝑥 − 𝑑))
67	66	eqeq2d 2744	. . . . . . 7 ⊢ (𝑐 = 𝑥 → ((𝐶 − 𝐷) = (𝑐 − 𝑑) ↔ (𝐶 − 𝐷) = (𝑥 − 𝑑)))
68		oveq1 7411	. . . . . . . . . 10 ⊢ (𝑐 = 𝑥 → (𝑐𝐼𝑑) = (𝑥𝐼𝑑))
69	68	eleq2d 2820	. . . . . . . . 9 ⊢ (𝑐 = 𝑥 → (𝑧 ∈ (𝑐𝐼𝑑) ↔ 𝑧 ∈ (𝑥𝐼𝑑)))
70		oveq1 7411	. . . . . . . . . 10 ⊢ (𝑐 = 𝑥 → (𝑐 − 𝑧) = (𝑥 − 𝑧))
71	70	eqeq2d 2744	. . . . . . . . 9 ⊢ (𝑐 = 𝑥 → ((𝐴 − 𝐵) = (𝑐 − 𝑧) ↔ (𝐴 − 𝐵) = (𝑥 − 𝑧)))
72	69, 71	anbi12d 632	. . . . . . . 8 ⊢ (𝑐 = 𝑥 → ((𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)) ↔ (𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
73	72	rexbidv 3179	. . . . . . 7 ⊢ (𝑐 = 𝑥 → (∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
74	67, 73	anbi12d 632	. . . . . 6 ⊢ (𝑐 = 𝑥 → (((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))) ↔ ((𝐶 − 𝐷) = (𝑥 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))))
75		oveq2 7412	. . . . . . . 8 ⊢ (𝑑 = 𝑦 → (𝑥 − 𝑑) = (𝑥 − 𝑦))
76	75	eqeq2d 2744	. . . . . . 7 ⊢ (𝑑 = 𝑦 → ((𝐶 − 𝐷) = (𝑥 − 𝑑) ↔ (𝐶 − 𝐷) = (𝑥 − 𝑦)))
77		oveq2 7412	. . . . . . . . . 10 ⊢ (𝑑 = 𝑦 → (𝑥𝐼𝑑) = (𝑥𝐼𝑦))
78	77	eleq2d 2820	. . . . . . . . 9 ⊢ (𝑑 = 𝑦 → (𝑧 ∈ (𝑥𝐼𝑑) ↔ 𝑧 ∈ (𝑥𝐼𝑦)))
79	78	anbi1d 631	. . . . . . . 8 ⊢ (𝑑 = 𝑦 → ((𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)) ↔ (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
80	79	rexbidv 3179	. . . . . . 7 ⊢ (𝑑 = 𝑦 → (∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
81	76, 80	anbi12d 632	. . . . . 6 ⊢ (𝑑 = 𝑦 → (((𝐶 − 𝐷) = (𝑥 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))) ↔ ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))))
82	74, 81	cbvrex2vw 3240	. . . . 5 ⊢ (∃𝑐 ∈ 𝑃 ∃𝑑 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))) ↔ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
83	65, 82	sylibr 233	. . . 4 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))) → ∃𝑐 ∈ 𝑃 ∃𝑑 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑐 − 𝑑) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑐𝐼𝑑) ∧ (𝐴 − 𝐵) = (𝑐 − 𝑧))))
84	64, 83	r19.29vva 3214	. . 3 ⊢ ((𝜑 ∧ ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
85	31	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐶 ∈ 𝑃)
86	35	adantr 482	. . . 4 ⊢ ((𝜑 ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → 𝐷 ∈ 𝑃)
87		eqidd 2734	. . . 4 ⊢ ((𝜑 ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → (𝐶 − 𝐷) = (𝐶 − 𝐷))
88		simpr 486	. . . 4 ⊢ ((𝜑 ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
89		oveq1 7411	. . . . . . 7 ⊢ (𝑥 = 𝐶 → (𝑥 − 𝑦) = (𝐶 − 𝑦))
90	89	eqeq2d 2744	. . . . . 6 ⊢ (𝑥 = 𝐶 → ((𝐶 − 𝐷) = (𝑥 − 𝑦) ↔ (𝐶 − 𝐷) = (𝐶 − 𝑦)))
91		oveq1 7411	. . . . . . . . 9 ⊢ (𝑥 = 𝐶 → (𝑥𝐼𝑦) = (𝐶𝐼𝑦))
92	91	eleq2d 2820	. . . . . . . 8 ⊢ (𝑥 = 𝐶 → (𝑧 ∈ (𝑥𝐼𝑦) ↔ 𝑧 ∈ (𝐶𝐼𝑦)))
93		oveq1 7411	. . . . . . . . 9 ⊢ (𝑥 = 𝐶 → (𝑥 − 𝑧) = (𝐶 − 𝑧))
94	93	eqeq2d 2744	. . . . . . . 8 ⊢ (𝑥 = 𝐶 → ((𝐴 − 𝐵) = (𝑥 − 𝑧) ↔ (𝐴 − 𝐵) = (𝐶 − 𝑧)))
95	92, 94	anbi12d 632	. . . . . . 7 ⊢ (𝑥 = 𝐶 → ((𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)) ↔ (𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
96	95	rexbidv 3179	. . . . . 6 ⊢ (𝑥 = 𝐶 → (∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
97	90, 96	anbi12d 632	. . . . 5 ⊢ (𝑥 = 𝐶 → (((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))) ↔ ((𝐶 − 𝐷) = (𝐶 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))))
98		oveq2 7412	. . . . . . 7 ⊢ (𝑦 = 𝐷 → (𝐶 − 𝑦) = (𝐶 − 𝐷))
99	98	eqeq2d 2744	. . . . . 6 ⊢ (𝑦 = 𝐷 → ((𝐶 − 𝐷) = (𝐶 − 𝑦) ↔ (𝐶 − 𝐷) = (𝐶 − 𝐷)))
100		oveq2 7412	. . . . . . . . 9 ⊢ (𝑦 = 𝐷 → (𝐶𝐼𝑦) = (𝐶𝐼𝐷))
101	100	eleq2d 2820	. . . . . . . 8 ⊢ (𝑦 = 𝐷 → (𝑧 ∈ (𝐶𝐼𝑦) ↔ 𝑧 ∈ (𝐶𝐼𝐷)))
102	101	anbi1d 631	. . . . . . 7 ⊢ (𝑦 = 𝐷 → ((𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)) ↔ (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
103	102	rexbidv 3179	. . . . . 6 ⊢ (𝑦 = 𝐷 → (∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
104	99, 103	anbi12d 632	. . . . 5 ⊢ (𝑦 = 𝐷 → (((𝐶 − 𝐷) = (𝐶 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) ↔ ((𝐶 − 𝐷) = (𝐶 − 𝐷) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))))
105	97, 104	rspc2ev 3623	. . . 4 ⊢ ((𝐶 ∈ 𝑃 ∧ 𝐷 ∈ 𝑃 ∧ ((𝐶 − 𝐷) = (𝐶 − 𝐷) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧)))) → ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
106	85, 86, 87, 88, 105	syl112anc 1375	. . 3 ⊢ ((𝜑 ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))) → ∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))))
107	84, 106	impbida 800	. 2 ⊢ (𝜑 → (∃𝑥 ∈ 𝑃 ∃𝑦 ∈ 𝑃 ((𝐶 − 𝐷) = (𝑥 − 𝑦) ∧ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝑥𝐼𝑦) ∧ (𝐴 − 𝐵) = (𝑥 − 𝑧))) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))
108	20, 107	bitrd 279	1 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑧))))

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 {copab 5209 ‘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: legov2 27817 legid 27818 btwnleg 27819 legtrd 27820 legtri3 27821 legtrid 27822 leg0 27823 mideulem 27967 opphllem3 27980

W3C validator