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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 2228 | . 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 2205 |
| 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 2216 |
| This theorem depends on definitions: df-bi 117 df-cleq 2227 |
| This theorem is referenced by: eqid 2234 sb8ab 2358 cbvabw 2359 cbvab 2360 vjust 2816 nfccdeq 3043 csbcow 3152 difeqri 3343 uneqri 3365 incom 3415 ineqri 3418 difin 3462 invdif 3467 indif 3468 difundi 3477 indifdir 3481 rabsnif 3763 pwv 3918 uniun 3938 intun 3985 intpr 3986 iuncom 4002 iuncom4 4003 iun0 4053 0iun 4054 iunin2 4060 iunun 4075 iunxun 4076 iunxiun 4078 iinpw 4087 inuni 4272 unidif0 4285 unipw 4338 snnex 4574 unon 4638 xpiundi 4813 xpiundir 4814 0xp 4835 iunxpf 4908 cnvuni 4946 dmiun 4970 dmuni 4971 epini 5138 rniun 5178 cnvresima 5257 imaco 5273 rnco 5274 dfmpt3 5486 imaiun 5939 opabex3d 6323 opabex3 6324 ecid 6845 qsid 6847 mapval2 6925 ixpin 6971 dfz2 9667 infssuzex 10615 dfrp2 10647 1nprm 12836 infpn2 13291 rrgval 14493 2idlval 14762 cnfldui 14849 zrhval 14877 plyun0 15713 edgval 16167 clwwlkn0 16515 clwwlknonmpo 16535 clwwlknon 16536 clwwlk0on0 16538 |
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