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| Mirrors > Home > ILE Home > Th. List > eqriv | GIF version | ||
| Description: Infer equality of classes from equivalence of membership. (Contributed by NM, 5-Aug-1993.) |
| Ref | Expression |
|---|---|
| eqriv.1 | ⊢ (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) |
| Ref | Expression |
|---|---|
| eqriv | ⊢ 𝐴 = 𝐵 |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | dfcleq 2225 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
| 2 | eqriv.1 | . 2 ⊢ (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) | |
| 3 | 1, 2 | mpgbir 1502 | 1 ⊢ 𝐴 = 𝐵 |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 = wceq 1398 ∈ wcel 2202 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-gen 1498 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-cleq 2224 |
| This theorem is referenced by: eqid 2231 sb8ab 2354 cbvabw 2355 cbvab 2356 vjust 2804 nfccdeq 3030 csbcow 3139 difeqri 3329 uneqri 3351 incom 3401 ineqri 3402 difin 3446 invdif 3451 indif 3452 difundi 3461 indifdir 3465 rabsnif 3742 pwv 3897 uniun 3917 intun 3964 intpr 3965 iuncom 3981 iuncom4 3982 iun0 4032 0iun 4033 iunin2 4039 iunun 4054 iunxun 4055 iunxiun 4057 iinpw 4066 inuni 4250 unidif0 4263 unipw 4315 snnex 4551 unon 4615 xpiundi 4790 xpiundir 4791 0xp 4812 iunxpf 4884 cnvuni 4922 dmiun 4946 dmuni 4947 epini 5114 rniun 5154 cnvresima 5233 imaco 5249 rnco 5250 dfmpt3 5462 imaiun 5911 opabex3d 6292 opabex3 6293 ecid 6810 qsid 6812 mapval2 6890 ixpin 6935 dfz2 9595 infssuzex 10537 dfrp2 10567 1nprm 12747 infpn2 13138 rrgval 14338 2idlval 14578 cnfldui 14665 zrhval 14693 plyun0 15527 edgval 15981 clwwlkn0 16329 clwwlknonmpo 16349 clwwlknon 16350 clwwlk0on0 16352 |
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