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| Description: Dominance law for Cartesian product. Theorem 6L(c) of [Enderton] p. 149. (Contributed by Mario Carneiro, 26-Apr-2015.) | 
| Ref | Expression | 
|---|---|
| xpdom2g | ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)) | 
| Step | Hyp | Ref | Expression | 
|---|---|---|---|
| 1 | xpeq1 5699 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐴) = (𝐶 × 𝐴)) | |
| 2 | xpeq1 5699 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐵) = (𝐶 × 𝐵)) | |
| 3 | 1, 2 | breq12d 5156 | . . . 4 ⊢ (𝑥 = 𝐶 → ((𝑥 × 𝐴) ≼ (𝑥 × 𝐵) ↔ (𝐶 × 𝐴) ≼ (𝐶 × 𝐵))) | 
| 4 | 3 | imbi2d 340 | . . 3 ⊢ (𝑥 = 𝐶 → ((𝐴 ≼ 𝐵 → (𝑥 × 𝐴) ≼ (𝑥 × 𝐵)) ↔ (𝐴 ≼ 𝐵 → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)))) | 
| 5 | vex 3484 | . . . 4 ⊢ 𝑥 ∈ V | |
| 6 | 5 | xpdom2 9107 | . . 3 ⊢ (𝐴 ≼ 𝐵 → (𝑥 × 𝐴) ≼ (𝑥 × 𝐵)) | 
| 7 | 4, 6 | vtoclg 3554 | . 2 ⊢ (𝐶 ∈ 𝑉 → (𝐴 ≼ 𝐵 → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵))) | 
| 8 | 7 | imp 406 | 1 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)) | 
| Colors of variables: wff setvar class | 
| Syntax hints: → wi 4 ∧ wa 395 = wceq 1540 ∈ wcel 2108 class class class wbr 5143 × cxp 5683 ≼ cdom 8983 | 
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1795 ax-4 1809 ax-5 1910 ax-6 1967 ax-7 2007 ax-8 2110 ax-9 2118 ax-10 2141 ax-11 2157 ax-12 2177 ax-ext 2708 ax-sep 5296 ax-nul 5306 ax-pow 5365 ax-pr 5432 ax-un 7755 | 
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1543 df-fal 1553 df-ex 1780 df-nf 1784 df-sb 2065 df-mo 2540 df-eu 2569 df-clab 2715 df-cleq 2729 df-clel 2816 df-nfc 2892 df-ne 2941 df-ral 3062 df-rex 3071 df-rab 3437 df-v 3482 df-sbc 3789 df-csb 3900 df-dif 3954 df-un 3956 df-in 3958 df-ss 3968 df-nul 4334 df-if 4526 df-pw 4602 df-sn 4627 df-pr 4629 df-op 4633 df-uni 4908 df-br 5144 df-opab 5206 df-mpt 5226 df-id 5578 df-xp 5691 df-rel 5692 df-cnv 5693 df-co 5694 df-dm 5695 df-rn 5696 df-res 5697 df-ima 5698 df-iota 6514 df-fun 6563 df-fn 6564 df-f 6565 df-f1 6566 df-fv 6569 df-dom 8987 | 
| This theorem is referenced by: xpdom1g 9109 xpen 9180 infxpdom 10250 fnct 10577 unirnfdomd 10607 gchxpidm 10709 gchhar 10719 | 
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