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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 2225 | . 2 ⊢ (𝐴 = 𝐵 ↔ ∀𝑥(𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵)) | |
| 2 | eqriv.1 | . 2 ⊢ (𝑥 ∈ 𝐴 ↔ 𝑥 ∈ 𝐵) | |
| 3 | 1, 2 | mpgbir 1501 | 1 ⊢ 𝐴 = 𝐵 |
| Colors of variables: wff set class |
| Syntax hints: ↔ wb 105 = wceq 1397 ∈ wcel 2202 |
| 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 1497 ax-ext 2213 |
| This theorem depends on definitions: df-bi 117 df-cleq 2224 |
| This theorem is referenced by: eqid 2231 sb8ab 2353 cbvabw 2354 cbvab 2355 vjust 2803 nfccdeq 3029 csbcow 3138 difeqri 3327 uneqri 3349 incom 3399 ineqri 3400 difin 3444 invdif 3449 indif 3450 difundi 3459 indifdir 3463 rabsnif 3738 pwv 3892 uniun 3912 intun 3959 intpr 3960 iuncom 3976 iuncom4 3977 iun0 4027 0iun 4028 iunin2 4034 iunun 4049 iunxun 4050 iunxiun 4052 iinpw 4061 inuni 4245 unidif0 4257 unipw 4309 snnex 4545 unon 4609 xpiundi 4784 xpiundir 4785 0xp 4806 iunxpf 4878 cnvuni 4916 dmiun 4940 dmuni 4941 epini 5107 rniun 5147 cnvresima 5226 imaco 5242 rnco 5243 dfmpt3 5455 imaiun 5901 opabex3d 6283 opabex3 6284 ecid 6767 qsid 6769 mapval2 6847 ixpin 6892 dfz2 9552 infssuzex 10494 dfrp2 10524 1nprm 12691 infpn2 13082 rrgval 14282 2idlval 14522 cnfldui 14609 zrhval 14637 plyun0 15466 edgval 15917 clwwlkn0 16265 clwwlknonmpo 16285 clwwlknon 16286 clwwlk0on0 16288 |
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