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| Mirrors > Home > MPE Home > Th. List > wdomen1 | Structured version Visualization version GIF version | ||
| Description: Equality-like theorem for equinumerosity and weak dominance. (Contributed by Mario Carneiro, 18-May-2015.) |
| Ref | Expression |
|---|---|
| wdomen1 | ⊢ (𝐴 ≈ 𝐵 → (𝐴 ≼* 𝐶 ↔ 𝐵 ≼* 𝐶)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ensym 9014 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 2 | endom 8990 | . . . 4 ⊢ (𝐵 ≈ 𝐴 → 𝐵 ≼ 𝐴) | |
| 3 | domwdom 9552 | . . . 4 ⊢ (𝐵 ≼ 𝐴 → 𝐵 ≼* 𝐴) | |
| 4 | 1, 2, 3 | 3syl 19 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≼* 𝐴) |
| 5 | wdomtr 9553 | . . 3 ⊢ ((𝐵 ≼* 𝐴 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) | |
| 6 | 4, 5 | sylan 592 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) |
| 7 | endom 8990 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼ 𝐵) | |
| 8 | domwdom 9552 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ≼* 𝐵) | |
| 9 | 7, 8 | syl 18 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼* 𝐵) |
| 10 | wdomtr 9553 | . . 3 ⊢ ((𝐴 ≼* 𝐵 ∧ 𝐵 ≼* 𝐶) → 𝐴 ≼* 𝐶) | |
| 11 | 9, 10 | sylan 592 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≼* 𝐶) → 𝐴 ≼* 𝐶) |
| 12 | 6, 11 | impbida 813 | 1 ⊢ (𝐴 ≈ 𝐵 → (𝐴 ≼* 𝐶 ↔ 𝐵 ≼* 𝐶)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 class class class wbr 5103 ≈ cen 8954 ≼ cdom 8955 ≼* cwdom 9542 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1943 ax-6 2000 ax-7 2041 ax-8 2147 ax-9 2155 ax-10 2178 ax-11 2194 ax-12 2213 ax-ext 2733 ax-sep 5249 ax-nul 5260 ax-pow 5327 ax-pr 5391 ax-un 7740 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1573 df-fal 1583 df-ex 1813 df-nf 1817 df-sb 2100 df-mo 2565 df-eu 2595 df-clab 2740 df-cleq 2753 df-clel 2836 df-nfc 2910 df-ne 2957 df-ral 3078 df-rex 3088 df-rab 3414 df-v 3453 df-dif 3902 df-un 3904 df-in 3906 df-ss 3916 df-nul 4280 df-if 4483 df-pw 4559 df-sn 4585 df-pr 4587 df-op 4591 df-uni 4868 df-br 5104 df-opab 5168 df-mpt 5187 df-id 5546 df-xp 5657 df-rel 5658 df-cnv 5659 df-co 5660 df-dm 5661 df-rn 5662 df-res 5663 df-ima 5664 df-fun 6533 df-fn 6534 df-f 6535 df-f1 6536 df-fo 6537 df-f1o 6538 df-er 8701 df-en 8958 df-dom 8959 df-sdom 8960 df-wdom 9543 |
| This theorem is used by: (None) |
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