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Theorem legtrd 27820

Description: Transitivity of the less-than relationship. Proposition 5.8 of [Schwabhauser] p. 42. (Contributed by Thierry Arnoux, 27-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)
legid.a	⊢ (𝜑 → 𝐴 ∈ 𝑃)
legid.b	⊢ (𝜑 → 𝐵 ∈ 𝑃)
legtrd.c	⊢ (𝜑 → 𝐶 ∈ 𝑃)
legtrd.d	⊢ (𝜑 → 𝐷 ∈ 𝑃)
legtrd.e	⊢ (𝜑 → 𝐸 ∈ 𝑃)
legtrd.f	⊢ (𝜑 → 𝐹 ∈ 𝑃)
legtrd.1	⊢ (𝜑 → (𝐴 − 𝐵) ≤ (𝐶 − 𝐷))
legtrd.2	⊢ (𝜑 → (𝐶 − 𝐷) ≤ (𝐸 − 𝐹))

**Assertion**
Ref	Expression
legtrd	⊢ (𝜑 → (𝐴 − 𝐵) ≤ (𝐸 − 𝐹))

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

Step	Hyp	Ref	Expression
1		legval.p	. . . . . 6 ⊢ 𝑃 = (Base‘𝐺)
2		eqid 2733	. . . . . 6 ⊢ (LineG‘𝐺) = (LineG‘𝐺)
3		legval.i	. . . . . 6 ⊢ 𝐼 = (Itv‘𝐺)
4		legval.g	. . . . . . 7 ⊢ (𝜑 → 𝐺 ∈ TarskiG)
5	4	ad4antr 731	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝐺 ∈ TarskiG)
6		legtrd.c	. . . . . . 7 ⊢ (𝜑 → 𝐶 ∈ 𝑃)
7	6	ad4antr 731	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝐶 ∈ 𝑃)
8		legtrd.d	. . . . . . 7 ⊢ (𝜑 → 𝐷 ∈ 𝑃)
9	8	ad4antr 731	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝐷 ∈ 𝑃)
10		simp-4r 783	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝑥 ∈ 𝑃)
11		eqid 2733	. . . . . 6 ⊢ (cgrG‘𝐺) = (cgrG‘𝐺)
12		legtrd.e	. . . . . . 7 ⊢ (𝜑 → 𝐸 ∈ 𝑃)
13	12	ad4antr 731	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝐸 ∈ 𝑃)
14		simplr 768	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝑦 ∈ 𝑃)
15		legval.d	. . . . . 6 ⊢ − = (dist‘𝐺)
16		simpllr 775	. . . . . . . 8 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥)))
17	16	simpld 496	. . . . . . 7 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → 𝑥 ∈ (𝐶𝐼𝐷))
18	1, 2, 3, 5, 7, 10, 9, 17	btwncolg3 27788	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → (𝐷 ∈ (𝐶(LineG‘𝐺)𝑥) ∨ 𝐶 = 𝑥))
19		simprr 772	. . . . . 6 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → (𝐶 − 𝐷) = (𝐸 − 𝑦))
20	1, 2, 3, 5, 7, 9, 10, 11, 13, 14, 15, 18, 19	lnext 27798	. . . . 5 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → ∃𝑧 ∈ 𝑃 ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩)
21	5	ad2antrr 725	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝐺 ∈ TarskiG)
22	13	ad2antrr 725	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝐸 ∈ 𝑃)
23		simplr 768	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑧 ∈ 𝑃)
24		simp-4r 783	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑦 ∈ 𝑃)
25		legtrd.f	. . . . . . . . . 10 ⊢ (𝜑 → 𝐹 ∈ 𝑃)
26	25	ad6antr 735	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝐹 ∈ 𝑃)
27	7	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝐶 ∈ 𝑃)
28	10	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑥 ∈ 𝑃)
29	9	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝐷 ∈ 𝑃)
30		simpr 486	. . . . . . . . . . 11 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩)
31	1, 15, 3, 11, 21, 27, 29, 28, 22, 24, 23, 30	cgr3swap23 27755	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → ⟨“𝐶𝑥𝐷”⟩(cgrG‘𝐺)⟨“𝐸𝑧𝑦”⟩)
32	17	ad2antrr 725	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑥 ∈ (𝐶𝐼𝐷))
33	1, 15, 3, 11, 21, 27, 28, 29, 22, 23, 24, 31, 32	tgbtwnxfr 27761	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑧 ∈ (𝐸𝐼𝑦))
34		simpllr 775	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦)))
35	34	simpld 496	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑦 ∈ (𝐸𝐼𝐹))
36	1, 15, 3, 21, 22, 23, 24, 26, 33, 35	tgbtwnexch 27729	. . . . . . . 8 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → 𝑧 ∈ (𝐸𝐼𝐹))
37		simp-5r 785	. . . . . . . . . 10 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥)))
38	37	simprd 497	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝐴 − 𝐵) = (𝐶 − 𝑥))
39	1, 15, 3, 11, 21, 27, 28, 29, 22, 23, 24, 31	cgr3simp1 27751	. . . . . . . . 9 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝐶 − 𝑥) = (𝐸 − 𝑧))
40	38, 39	eqtrd 2773	. . . . . . . 8 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝐴 − 𝐵) = (𝐸 − 𝑧))
41	36, 40	jca 513	. . . . . . 7 ⊢ (((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) ∧ ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩) → (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧)))
42	41	ex 414	. . . . . 6 ⊢ ((((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) ∧ 𝑧 ∈ 𝑃) → (⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩ → (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧))))
43	42	reximdva 3169	. . . . 5 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → (∃𝑧 ∈ 𝑃 ⟨“𝐶𝐷𝑥”⟩(cgrG‘𝐺)⟨“𝐸𝑦𝑧”⟩ → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧))))
44	20, 43	mpd 15	. . . 4 ⊢ (((((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) ∧ 𝑦 ∈ 𝑃) ∧ (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧)))
45		legtrd.2	. . . . . 6 ⊢ (𝜑 → (𝐶 − 𝐷) ≤ (𝐸 − 𝐹))
46		legval.l	. . . . . . 7 ⊢ ≤ = (≤G‘𝐺)
47	1, 15, 3, 46, 4, 6, 8, 12, 25	legov 27816	. . . . . 6 ⊢ (𝜑 → ((𝐶 − 𝐷) ≤ (𝐸 − 𝐹) ↔ ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦))))
48	45, 47	mpbid 231	. . . . 5 ⊢ (𝜑 → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦)))
49	48	ad2antrr 725	. . . 4 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) → ∃𝑦 ∈ 𝑃 (𝑦 ∈ (𝐸𝐼𝐹) ∧ (𝐶 − 𝐷) = (𝐸 − 𝑦)))
50	44, 49	r19.29a 3163	. . 3 ⊢ (((𝜑 ∧ 𝑥 ∈ 𝑃) ∧ (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))) → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧)))
51		legtrd.1	. . . 4 ⊢ (𝜑 → (𝐴 − 𝐵) ≤ (𝐶 − 𝐷))
52		legid.a	. . . . 5 ⊢ (𝜑 → 𝐴 ∈ 𝑃)
53		legid.b	. . . . 5 ⊢ (𝜑 → 𝐵 ∈ 𝑃)
54	1, 15, 3, 46, 4, 52, 53, 6, 8	legov 27816	. . . 4 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐶 − 𝐷) ↔ ∃𝑥 ∈ 𝑃 (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥))))
55	51, 54	mpbid 231	. . 3 ⊢ (𝜑 → ∃𝑥 ∈ 𝑃 (𝑥 ∈ (𝐶𝐼𝐷) ∧ (𝐴 − 𝐵) = (𝐶 − 𝑥)))
56	50, 55	r19.29a 3163	. 2 ⊢ (𝜑 → ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧)))
57	1, 15, 3, 46, 4, 52, 53, 12, 25	legov 27816	. 2 ⊢ (𝜑 → ((𝐴 − 𝐵) ≤ (𝐸 − 𝐹) ↔ ∃𝑧 ∈ 𝑃 (𝑧 ∈ (𝐸𝐼𝐹) ∧ (𝐴 − 𝐵) = (𝐸 − 𝑧))))
58	56, 57	mpbird 257	1 ⊢ (𝜑 → (𝐴 − 𝐵) ≤ (𝐸 − 𝐹))

Colors of variables: wff setvar class

Syntax hints: → wi 4 ∧ 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: legso 27830

W3C validator