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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 2232 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
| 2 | eqriv.1 | . 2 ⊢ (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) | |
| 3 | 1, 2 | mpgbir 1506 | 1 ⊢ 𝐴 = 𝐵 |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 = wceq 1402 ∈ wcel 2209 |
| 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 1502 ax-ext 2220 |
| This theorem depends on definitions: df-bi 117 df-cleq 2231 |
| This theorem is referenced by: eqid 2238 sb8ab 2362 cbvabw 2363 cbvab 2364 vjust 2822 nfccdeq 3049 csbcow 3158 difeqri 3349 uneqri 3371 incom 3421 ineqri 3424 difin 3468 invdif 3473 indif 3474 difundi 3483 indifdir 3487 rabsnif 3777 pwv 3932 uniun 3952 intun 3999 intpr 4000 iuncom 4016 iuncom4 4017 iun0 4067 0iun 4068 iunin2 4074 iunun 4089 iunxun 4090 iunxiun 4092 iinpw 4101 inuni 4289 unidif0 4302 unipw 4355 snnex 4592 unon 4656 xpiundi 4831 xpiundir 4832 0xp 4853 iunxpf 4926 cnvuni 4964 dmiun 4988 dmuni 4989 epini 5156 rniun 5196 cnvresima 5275 imaco 5291 rnco 5292 dfmpt3 5504 imaiun 5960 opabex3d 6344 opabex3 6345 ecid 6866 qsid 6868 mapval2 6953 ixpin 6999 dfz2 9700 infssuzex 10649 dfrp2 10681 1nprm 12875 infpn2 13330 mgpplusg 14205 mgpbas 14208 ringidval 14248 rrgval 14553 2idlval 14822 cnfldui 14907 zrhval 14935 asclfval 15004 plyun0 15820 edgval 16284 clwwlkn0 16632 clwwlknonmpo 16652 clwwlknon 16653 clwwlk0on0 16655 |
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