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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 4293 unidif0 4306 unipw 4359 snnex 4596 unon 4660 xpiundi 4835 xpiundir 4836 0xp 4857 iunxpf 4930 cnvuni 4968 dmiun 4992 dmuni 4993 epini 5161 rniun 5201 cnvresima 5280 imaco 5296 rnco 5297 dfmpt3 5509 imaiun 5969 opabex3d 6354 opabex3 6355 ecid 6876 qsid 6878 mapval2 6963 ixpin 7010 dfz2 9729 infssuzex 10684 dfrp2 10716 1nprm 12918 infpn2 13406 cntrval 14152 mgpplusg 14330 mgpbas 14333 ringidval 14373 rrgval 14680 2idlval 14949 cnfldui 15034 zrhval 15062 asclfval 15131 plyun0 15974 edgval 16518 clwwlkn0 16866 clwwlknonmpo 16886 clwwlknon 16887 clwwlk0on0 16889 idjudju 17264 |
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