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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 |
| This proof depends on syntax axioms: ↔ wb 105 = wceq 1402 ∈ wcel 2209 |
| This proof depends on 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 proof depends on definitions: df-bi 117 df-cleq 2231 |
| This theorem is used 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 3778 pwv 3934 uniun 3954 intun 4001 intpr 4002 iuncom 4018 iuncom4 4019 iun0 4069 0iun 4070 iunin2 4076 iunun 4091 iunxun 4092 iunxiun 4094 iinpw 4103 inuni 4291 unidif0 4304 unipw 4357 snnex 4594 unon 4658 xpiundi 4833 xpiundir 4834 0xp 4855 iunxpf 4928 cnvuni 4966 dmiun 4990 dmuni 4991 epini 5158 rniun 5198 cnvresima 5277 imaco 5293 rnco 5294 dfmpt3 5506 imaiun 5966 opabex3d 6350 opabex3 6351 ecid 6872 qsid 6874 mapval2 6959 ixpin 7005 dfz2 9719 infssuzex 10668 dfrp2 10700 1nprm 12894 infpn2 13349 mgpplusg 14224 mgpbas 14227 ringidval 14267 rrgval 14572 2idlval 14841 cnfldui 14926 zrhval 14954 asclfval 15023 plyun0 15839 edgval 16313 clwwlkn0 16661 clwwlknonmpo 16681 clwwlknon 16682 clwwlk0on0 16684 |
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