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| Mirrors > Home > MPE Home > Th. List > xpdom2g | Structured version Visualization version GIF version | ||
| 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 5645 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐴) = (𝐶 × 𝐴)) | |
| 2 | xpeq1 5645 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐵) = (𝐶 × 𝐵)) | |
| 3 | 1, 2 | breq12d 5098 | . . . 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 3433 | . . . 4 ⊢ 𝑥 ∈ V | |
| 6 | 5 | xpdom2 9010 | . . 3 ⊢ (𝐴 ≼ 𝐵 → (𝑥 × 𝐴) ≼ (𝑥 × 𝐵)) |
| 7 | 4, 6 | vtoclg 3499 | . 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 1542 ∈ wcel 2114 class class class wbr 5085 × cxp 5629 ≼ cdom 8891 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-10 2147 ax-11 2163 ax-12 2185 ax-ext 2708 ax-sep 5231 ax-nul 5241 ax-pow 5307 ax-pr 5375 ax-un 7689 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-nf 1786 df-sb 2069 df-mo 2539 df-eu 2569 df-clab 2715 df-cleq 2728 df-clel 2811 df-nfc 2885 df-ne 2933 df-ral 3052 df-rex 3062 df-rab 3390 df-v 3431 df-sbc 3729 df-csb 3838 df-dif 3892 df-un 3894 df-in 3896 df-ss 3906 df-nul 4274 df-if 4467 df-pw 4543 df-sn 4568 df-pr 4570 df-op 4574 df-uni 4851 df-br 5086 df-opab 5148 df-mpt 5167 df-id 5526 df-xp 5637 df-rel 5638 df-cnv 5639 df-co 5640 df-dm 5641 df-rn 5642 df-res 5643 df-ima 5644 df-iota 6454 df-fun 6500 df-fn 6501 df-f 6502 df-f1 6503 df-fv 6506 df-dom 8895 |
| This theorem is referenced by: xpdom1g 9012 xpen 9078 infxpdom 10132 fnct 10459 unirnfdomd 10490 gchxpidm 10592 gchhar 10602 |
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