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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 8941 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 2 | endom 8917 | . . . 4 ⊢ (𝐵 ≈ 𝐴 → 𝐵 ≼ 𝐴) | |
| 3 | domwdom 9480 | . . . 4 ⊢ (𝐵 ≼ 𝐴 → 𝐵 ≼* 𝐴) | |
| 4 | 1, 2, 3 | 3syl 18 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≼* 𝐴) |
| 5 | wdomtr 9481 | . . 3 ⊢ ((𝐵 ≼* 𝐴 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) | |
| 6 | 4, 5 | sylan 581 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) |
| 7 | endom 8917 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼ 𝐵) | |
| 8 | domwdom 9480 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ≼* 𝐵) | |
| 9 | 7, 8 | syl 17 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼* 𝐵) |
| 10 | wdomtr 9481 | . . 3 ⊢ ((𝐴 ≼* 𝐵 ∧ 𝐵 ≼* 𝐶) → 𝐴 ≼* 𝐶) | |
| 11 | 9, 10 | sylan 581 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐵 ≼* 𝐶) → 𝐴 ≼* 𝐶) |
| 12 | 6, 11 | impbida 801 | 1 ⊢ (𝐴 ≈ 𝐵 → (𝐴 ≼* 𝐶 ↔ 𝐵 ≼* 𝐶)) |
| Colors of variables: wff setvar class |
| Syntax hints: → wi 4 ↔ wb 206 class class class wbr 5086 ≈ cen 8881 ≼ cdom 8882 ≼* cwdom 9470 |
| 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 2709 ax-sep 5231 ax-nul 5241 ax-pow 5300 ax-pr 5368 ax-un 7680 |
| 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 2540 df-eu 2570 df-clab 2716 df-cleq 2729 df-clel 2812 df-nfc 2886 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-pw 4544 df-sn 4569 df-pr 4571 df-op 4575 df-uni 4852 df-br 5087 df-opab 5149 df-mpt 5168 df-id 5517 df-xp 5628 df-rel 5629 df-cnv 5630 df-co 5631 df-dm 5632 df-rn 5633 df-res 5634 df-ima 5635 df-fun 6492 df-fn 6493 df-f 6494 df-f1 6495 df-fo 6496 df-f1o 6497 df-er 8634 df-en 8885 df-dom 8886 df-sdom 8887 df-wdom 9471 |
| This theorem is referenced by: (None) |
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