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| Mirrors > Home > MPE Home > Th. List > eqeng | Structured version Visualization version GIF version | ||
| Description: Equality implies equinumerosity. (Contributed by NM, 26-Oct-2003.) |
| Ref | Expression |
|---|---|
| eqeng | ⊢ (𝐴 ∈ 𝑉 → (𝐴 = 𝐵 → 𝐴 ≈ 𝐵)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | enrefg 9049 | . 2 ⊢ (𝐴 ∈ 𝑉 → 𝐴 ≈ 𝐴) | |
| 2 | breq2 5112 | . 2 ⊢ (𝐴 = 𝐵 → (𝐴 ≈ 𝐴 ↔ 𝐴 ≈ 𝐵)) | |
| 3 | 1, 2 | syl5ibcom 248 | 1 ⊢ (𝐴 ∈ 𝑉 → (𝐴 = 𝐵 → 𝐴 ≈ 𝐵)) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: → wi 4 = wceq 1570 ∈ wcel 2147 class class class wbr 5108 ≈ cen 9008 |
| 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-ext 2735 ax-sep 5255 ax-pow 5334 ax-pr 5398 ax-un 7783 |
| 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-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 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 4841 df-uni 4873 df-br 5109 df-opab 5174 df-id 5553 df-xp 5664 df-rel 5665 df-cnv 5666 df-co 5667 df-dm 5668 df-rn 5669 df-res 5670 df-ima 5671 df-fun 6568 df-fn 6569 df-f 6570 df-f1 6571 df-fo 6572 df-f1o 6573 df-en 9012 |
| This theorem is used by: idssen 9062 alephord 10193 alephdom 10199 fin23lem25 10441 alephadd 10701 kardeq0 35965 aks5lem7 43516 safesnsupfidom1o 44679 rp-isfinite5 44779 sn1dom 44788 prstchom2ALT 51033 |
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