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Theorem ndmovord 7462

Description: Elimination of redundant antecedents in an ordering law. (Contributed by NM, 7-Mar-1996.)

**Hypotheses**
Ref	Expression
ndmov.1	⊢ dom 𝐹 = (𝑆 × 𝑆)
ndmovord.4	⊢ 𝑅 ⊆ (𝑆 × 𝑆)
ndmovord.5	⊢ ¬ ∅ ∈ 𝑆
ndmovord.6	⊢ ((𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆 ∧ 𝐶 ∈ 𝑆) → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵)))

**Assertion**
Ref	Expression
ndmovord	⊢ (𝐶 ∈ 𝑆 → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵)))

**Proof of Theorem ndmovord**
Step	Hyp	Ref	Expression
1		ndmovord.6	. . 3 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆 ∧ 𝐶 ∈ 𝑆) → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵)))
2	1	3expia 1120	. 2 ⊢ ((𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐶 ∈ 𝑆 → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵))))
3		ndmovord.4	. . . . 5 ⊢ 𝑅 ⊆ (𝑆 × 𝑆)
4	3	brel 5652	. . . 4 ⊢ (𝐴𝑅𝐵 → (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆))
5	3	brel 5652	. . . . 5 ⊢ ((𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵) → ((𝐶𝐹𝐴) ∈ 𝑆 ∧ (𝐶𝐹𝐵) ∈ 𝑆))
6		ndmov.1	. . . . . . . 8 ⊢ dom 𝐹 = (𝑆 × 𝑆)
7		ndmovord.5	. . . . . . . 8 ⊢ ¬ ∅ ∈ 𝑆
8	6, 7	ndmovrcl 7458	. . . . . . 7 ⊢ ((𝐶𝐹𝐴) ∈ 𝑆 → (𝐶 ∈ 𝑆 ∧ 𝐴 ∈ 𝑆))
9	8	simprd 496	. . . . . 6 ⊢ ((𝐶𝐹𝐴) ∈ 𝑆 → 𝐴 ∈ 𝑆)
10	6, 7	ndmovrcl 7458	. . . . . . 7 ⊢ ((𝐶𝐹𝐵) ∈ 𝑆 → (𝐶 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆))
11	10	simprd 496	. . . . . 6 ⊢ ((𝐶𝐹𝐵) ∈ 𝑆 → 𝐵 ∈ 𝑆)
12	9, 11	anim12i 613	. . . . 5 ⊢ (((𝐶𝐹𝐴) ∈ 𝑆 ∧ (𝐶𝐹𝐵) ∈ 𝑆) → (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆))
13	5, 12	syl 17	. . . 4 ⊢ ((𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵) → (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆))
14	4, 13	pm5.21ni 379	. . 3 ⊢ (¬ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵)))
15	14	a1d 25	. 2 ⊢ (¬ (𝐴 ∈ 𝑆 ∧ 𝐵 ∈ 𝑆) → (𝐶 ∈ 𝑆 → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵))))
16	2, 15	pm2.61i 182	1 ⊢ (𝐶 ∈ 𝑆 → (𝐴𝑅𝐵 ↔ (𝐶𝐹𝐴)𝑅(𝐶𝐹𝐵)))

Colors of variables: wff setvar class

Syntax hints: ¬ wn 3 → wi 4 ↔ wb 205 ∧ wa 396 ∧ w3a 1086 = wceq 1539 ∈ wcel 2106 ⊆ wss 3887 ∅c0 4256 class class class wbr 5074 × cxp 5587 dom cdm 5589 (class class class)co 7275

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 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5223 ax-nul 5230 ax-pr 5352

This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-mo 2540 df-eu 2569 df-clab 2716 df-cleq 2730 df-clel 2816 df-ral 3069 df-rex 3070 df-rab 3073 df-v 3434 df-dif 3890 df-un 3892 df-in 3894 df-ss 3904 df-nul 4257 df-if 4460 df-sn 4562 df-pr 4564 df-op 4568 df-uni 4840 df-br 5075 df-opab 5137 df-xp 5595 df-dm 5599 df-iota 6391 df-fv 6441 df-ov 7278

This theorem is referenced by: ltapi 10659 ltmpi 10660 ltanq 10727 ltmnq 10728 ltapr 10801 ltasr 10856

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