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| Mirrors > Home > MPE Home > Th. List > wdomen2 | Structured version Visualization version GIF version | ||
| Description: Equality-like theorem for equinumerosity and weak dominance. (Contributed by Mario Carneiro, 18-May-2015.) |
| Ref | Expression |
|---|---|
| wdomen2 | ⊢ (𝐴 ≈ 𝐵 → (𝐶 ≼* 𝐴 ↔ 𝐶 ≼* 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | id 23 | . . 3 ⊢ (𝐶 ≼* 𝐴 → 𝐶 ≼* 𝐴) | |
| 2 | endom 9017 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼ 𝐵) | |
| 3 | domwdom 9578 | . . . 4 ⊢ (𝐴 ≼ 𝐵 → 𝐴 ≼* 𝐵) | |
| 4 | 2, 3 | syl 18 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐴 ≼* 𝐵) |
| 5 | wdomtr 9579 | . . 3 ⊢ ((𝐶 ≼* 𝐴 ∧ 𝐴 ≼* 𝐵) → 𝐶 ≼* 𝐵) | |
| 6 | 1, 4, 5 | syl2anr 609 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≼* 𝐴) → 𝐶 ≼* 𝐵) |
| 7 | id 23 | . . 3 ⊢ (𝐶 ≼* 𝐵 → 𝐶 ≼* 𝐵) | |
| 8 | ensym 9041 | . . . 4 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≈ 𝐴) | |
| 9 | endom 9017 | . . . 4 ⊢ (𝐵 ≈ 𝐴 → 𝐵 ≼ 𝐴) | |
| 10 | domwdom 9578 | . . . 4 ⊢ (𝐵 ≼ 𝐴 → 𝐵 ≼* 𝐴) | |
| 11 | 8, 9, 10 | 3syl 19 | . . 3 ⊢ (𝐴 ≈ 𝐵 → 𝐵 ≼* 𝐴) |
| 12 | wdomtr 9579 | . . 3 ⊢ ((𝐶 ≼* 𝐵 ∧ 𝐵 ≼* 𝐴) → 𝐶 ≼* 𝐴) | |
| 13 | 7, 11, 12 | syl2anr 609 | . 2 ⊢ ((𝐴 ≈ 𝐵 ∧ 𝐶 ≼* 𝐵) → 𝐶 ≼* 𝐴) |
| 14 | 6, 13 | impbida 813 | 1 ⊢ (𝐴 ≈ 𝐵 → (𝐶 ≼* 𝐴 ↔ 𝐶 ≼* 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 209 class class class wbr 5105 ≈ cen 8981 ≼ cdom 8982 ≼* cwdom 9568 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1944 ax-6 2001 ax-7 2042 ax-8 2148 ax-9 2156 ax-10 2179 ax-11 2196 ax-12 2215 ax-ext 2735 ax-sep 5251 ax-nul 5262 ax-pow 5330 ax-pr 5394 ax-un 7758 |
| This proof depends on definitions: df-bi 210 df-an 402 df-or 862 df-3an 1105 df-tru 1572 df-fal 1582 df-ex 1812 df-nf 1816 df-sb 2101 df-mo 2567 df-eu 2597 df-clab 2742 df-cleq 2755 df-clel 2838 df-nfc 2912 df-ne 2959 df-ral 3080 df-rex 3090 df-rab 3416 df-v 3455 df-ss 3900 df-dif 4049 df-in 4093 df-un 4153 df-nul 4281 df-if 4485 df-pw 4561 df-sn 4588 df-pr 4590 df-op 4838 df-uni 4870 df-br 5106 df-opab 5170 df-mpt 5189 df-id 5549 df-xp 5660 df-rel 5661 df-cnv 5662 df-co 5663 df-dm 5664 df-rn 5665 df-res 5666 df-ima 5667 df-fun 6548 df-fn 6549 df-f 6550 df-f1 6551 df-fo 6552 df-f1o 6553 df-er 8728 df-en 8985 df-dom 8986 df-sdom 8987 df-wdom 9569 |
| This theorem is used by: (None) |
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