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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 2226 | . 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 2203 |
| 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 2214 |
| This theorem depends on definitions: df-bi 117 df-cleq 2225 |
| This theorem is referenced by: eqid 2232 sb8ab 2356 cbvabw 2357 cbvab 2358 vjust 2813 nfccdeq 3039 csbcow 3148 difeqri 3338 uneqri 3360 incom 3410 ineqri 3413 difin 3457 invdif 3462 indif 3463 difundi 3472 indifdir 3476 rabsnif 3757 pwv 3912 uniun 3932 intun 3979 intpr 3980 iuncom 3996 iuncom4 3997 iun0 4047 0iun 4048 iunin2 4054 iunun 4069 iunxun 4070 iunxiun 4072 iinpw 4081 inuni 4266 unidif0 4279 unipw 4332 snnex 4568 unon 4632 xpiundi 4807 xpiundir 4808 0xp 4829 iunxpf 4902 cnvuni 4940 dmiun 4964 dmuni 4965 epini 5132 rniun 5172 cnvresima 5251 imaco 5267 rnco 5268 dfmpt3 5480 imaiun 5932 opabex3d 6313 opabex3 6314 ecid 6831 qsid 6833 mapval2 6911 ixpin 6957 dfz2 9649 infssuzex 10592 dfrp2 10622 1nprm 12807 infpn2 13199 rrgval 14399 2idlval 14642 cnfldui 14729 zrhval 14757 plyun0 15593 edgval 16047 clwwlkn0 16395 clwwlknonmpo 16415 clwwlknon 16416 clwwlk0on0 16418 |
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