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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 9058 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 2 | endom 9034 | . . . 4 ⊢ (𝐵 ≈ 𝐴 → 𝐵 ≼ 𝐴) | |
| 3 | domwdom 9595 | . . . 4 ⊢ (𝐵 ≼ 𝐴 → 𝐵 ≼* 𝐴) | |
| 4 | 1, 2, 3 | 3syl 19 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≼* 𝐴) |
| 5 | wdomtr 9596 | . . 3 ⊢ ((𝐵 ≼* 𝐴 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) | |
| 6 | 4, 5 | sylan 592 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐴 ≼* 𝐶) → 𝐵 ≼* 𝐶) |
| 7 | endom 9034 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼ 𝐵) | |
| 8 | domwdom 9595 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ≼* 𝐵) | |
| 9 | 7, 8 | syl 18 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼* 𝐵) |
| 10 | wdomtr 9596 | . . 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 5106 ≈ cen 8998 ≼ cdom 8999 ≼* cwdom 9585 |
| 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 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-10 2180 ax-11 2197 ax-12 2216 ax-ext 2735 ax-sep 5252 ax-nul 5263 ax-pow 5331 ax-pr 5395 ax-un 7775 |
| 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 2102 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2839 df-nfc 2913 df-ne 2960 df-ral 3081 df-rex 3091 df-rab 3417 df-v 3456 df-ss 3901 df-dif 4050 df-in 4094 df-un 4154 df-nul 4282 df-if 4486 df-pw 4562 df-sn 4589 df-pr 4591 df-op 4839 df-uni 4871 df-br 5107 df-opab 5171 df-mpt 5190 df-id 5550 df-xp 5661 df-rel 5662 df-cnv 5663 df-co 5664 df-dm 5665 df-rn 5666 df-res 5667 df-ima 5668 df-fun 6560 df-fn 6561 df-f 6562 df-f1 6563 df-fo 6564 df-f1o 6565 df-er 8745 df-en 9002 df-dom 9003 df-sdom 9004 df-wdom 9586 |
| This theorem is used by: (None) |
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