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Mirrors > Home > ILE Home > Th. List > xpdom2g | 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 4618 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐴) = (𝐶 × 𝐴)) | |
2 | xpeq1 4618 | . . . . 5 ⊢ (𝑥 = 𝐶 → (𝑥 × 𝐵) = (𝐶 × 𝐵)) | |
3 | 1, 2 | breq12d 3995 | . . . 4 ⊢ (𝑥 = 𝐶 → ((𝑥 × 𝐴) ≼ (𝑥 × 𝐵) ↔ (𝐶 × 𝐴) ≼ (𝐶 × 𝐵))) |
4 | 3 | imbi2d 229 | . . 3 ⊢ (𝑥 = 𝐶 → ((𝐴 ≼ 𝐵 → (𝑥 × 𝐴) ≼ (𝑥 × 𝐵)) ↔ (𝐴 ≼ 𝐵 → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)))) |
5 | vex 2729 | . . . 4 ⊢ 𝑥 ∈ V | |
6 | 5 | xpdom2 6797 | . . 3 ⊢ (𝐴 ≼ 𝐵 → (𝑥 × 𝐴) ≼ (𝑥 × 𝐵)) |
7 | 4, 6 | vtoclg 2786 | . 2 ⊢ (𝐶 ∈ 𝑉 → (𝐴 ≼ 𝐵 → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵))) |
8 | 7 | imp 123 | 1 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)) |
Colors of variables: wff set class |
Syntax hints: → wi 4 ∧ wa 103 = wceq 1343 ∈ wcel 2136 class class class wbr 3982 × cxp 4602 ≼ cdom 6705 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 105 ax-ia2 106 ax-ia3 107 ax-io 699 ax-5 1435 ax-7 1436 ax-gen 1437 ax-ie1 1481 ax-ie2 1482 ax-8 1492 ax-10 1493 ax-11 1494 ax-i12 1495 ax-bndl 1497 ax-4 1498 ax-17 1514 ax-i9 1518 ax-ial 1522 ax-i5r 1523 ax-13 2138 ax-14 2139 ax-ext 2147 ax-sep 4100 ax-pow 4153 ax-pr 4187 ax-un 4411 |
This theorem depends on definitions: df-bi 116 df-3an 970 df-tru 1346 df-nf 1449 df-sb 1751 df-eu 2017 df-mo 2018 df-clab 2152 df-cleq 2158 df-clel 2161 df-nfc 2297 df-ral 2449 df-rex 2450 df-rab 2453 df-v 2728 df-sbc 2952 df-csb 3046 df-un 3120 df-in 3122 df-ss 3129 df-pw 3561 df-sn 3582 df-pr 3583 df-op 3585 df-uni 3790 df-br 3983 df-opab 4044 df-mpt 4045 df-id 4271 df-xp 4610 df-rel 4611 df-cnv 4612 df-co 4613 df-dm 4614 df-rn 4615 df-res 4616 df-ima 4617 df-iota 5153 df-fun 5190 df-fn 5191 df-f 5192 df-f1 5193 df-fv 5196 df-dom 6708 |
This theorem is referenced by: xpdom1g 6799 |
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