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| Mirrors > Home > ILE Home > Th. List > xpdom1g | GIF version | ||
| Description: Dominance law for Cartesian product. Theorem 6L(c) of [Enderton] p. 149. (Contributed by NM, 25-Mar-2006.) (Revised by Mario Carneiro, 26-Apr-2015.) |
| Ref | Expression |
|---|---|
| xpdom1g | ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐶) ≼ (𝐵 × 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | reldom 6909 | . . . 4 ⊢ Rel ≼ | |
| 2 | 1 | brrelex1i 4767 | . . 3 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ∈ V) |
| 3 | xpcomeng 7007 | . . . 4 ⊢ ((𝐴 ∈ V ∧ 𝐶 ∈ 𝑉) → (𝐴 × 𝐶) ≈ (𝐶 × 𝐴)) | |
| 4 | 3 | ancoms 268 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ∈ V) → (𝐴 × 𝐶) ≈ (𝐶 × 𝐴)) |
| 5 | 2, 4 | sylan2 286 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐶) ≈ (𝐶 × 𝐴)) |
| 6 | xpdom2g 7011 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐴) ≼ (𝐶 × 𝐵)) | |
| 7 | 1 | brrelex2i 4768 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐵 ∈ V) |
| 8 | xpcomeng 7007 | . . . 4 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐵 ∈ V) → (𝐶 × 𝐵) ≈ (𝐵 × 𝐶)) | |
| 9 | 7, 8 | sylan2 286 | . . 3 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐵) ≈ (𝐵 × 𝐶)) |
| 10 | domentr 6960 | . . 3 ⊢ (((𝐶 × 𝐴) ≼ (𝐶 × 𝐵) ∧ (𝐶 × 𝐵) ≈ (𝐵 × 𝐶)) → (𝐶 × 𝐴) ≼ (𝐵 × 𝐶)) | |
| 11 | 6, 9, 10 | syl2anc 411 | . 2 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐶 × 𝐴) ≼ (𝐵 × 𝐶)) |
| 12 | endomtr 6959 | . 2 ⊢ (((𝐴 × 𝐶) ≈ (𝐶 × 𝐴) ∧ (𝐶 × 𝐴) ≼ (𝐵 × 𝐶)) → (𝐴 × 𝐶) ≼ (𝐵 × 𝐶)) | |
| 13 | 5, 11, 12 | syl2anc 411 | 1 ⊢ ((𝐶 ∈ 𝑉 ∧ 𝐴 ≼ 𝐵) → (𝐴 × 𝐶) ≼ (𝐵 × 𝐶)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ∈ wcel 2200 Vcvv 2800 class class class wbr 4086 × cxp 4721 ≈ cen 6902 ≼ cdom 6903 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 714 ax-5 1493 ax-7 1494 ax-gen 1495 ax-ie1 1539 ax-ie2 1540 ax-8 1550 ax-10 1551 ax-11 1552 ax-i12 1553 ax-bndl 1555 ax-4 1556 ax-17 1572 ax-i9 1576 ax-ial 1580 ax-i5r 1581 ax-13 2202 ax-14 2203 ax-ext 2211 ax-sep 4205 ax-pow 4262 ax-pr 4297 ax-un 4528 |
| This theorem depends on definitions: df-bi 117 df-3an 1004 df-tru 1398 df-nf 1507 df-sb 1809 df-eu 2080 df-mo 2081 df-clab 2216 df-cleq 2222 df-clel 2225 df-nfc 2361 df-ral 2513 df-rex 2514 df-rab 2517 df-v 2802 df-sbc 3030 df-csb 3126 df-un 3202 df-in 3204 df-ss 3211 df-pw 3652 df-sn 3673 df-pr 3674 df-op 3676 df-uni 3892 df-br 4087 df-opab 4149 df-mpt 4150 df-id 4388 df-xp 4729 df-rel 4730 df-cnv 4731 df-co 4732 df-dm 4733 df-rn 4734 df-res 4735 df-ima 4736 df-iota 5284 df-fun 5326 df-fn 5327 df-f 5328 df-f1 5329 df-fo 5330 df-f1o 5331 df-fv 5332 df-1st 6298 df-2nd 6299 df-en 6905 df-dom 6906 |
| This theorem is referenced by: xpdom1 7014 xpct 13007 |
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