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| Mirrors > Home > ILE Home > Th. List > rexeqdv | GIF version | ||
| Description: Equality deduction for restricted existential quantifier. (Contributed by NM, 14-Jan-2007.) |
| Ref | Expression |
|---|---|
| raleq1d.1 | ⊢ (𝜑 → 𝐴 = 𝐵) |
| Ref | Expression |
|---|---|
| rexeqdv | ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | raleq1d.1 | . 2 ⊢ (𝜑 → 𝐴 = 𝐵) | |
| 2 | rexeq 2750 | . 2 ⊢ (𝐴 = 𝐵 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜓)) | |
| 3 | 1, 2 | syl 14 | 1 ⊢ (𝜑 → (∃𝑥 ∈ 𝐴 𝜓 ↔ ∃𝑥 ∈ 𝐵 𝜓)) |
| Colors of variables: wff set class |
| This proof depends on syntax axioms: → wi 4 ↔ wb 105 = wceq 1402 ∃wrex 2529 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-ia2 107 ax-ia3 108 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-ext 2220 |
| This proof depends on definitions: df-bi 117 df-tru 1405 df-nf 1514 df-sb 1816 df-cleq 2231 df-clel 2234 df-nfc 2381 df-rex 2534 |
| This theorem is used by: rexeqtrdv 2758 rexeqtrrdv 2760 rexeqbidv 2766 rexeqbidva 2768 fnunirn 5976 cbvexfo 5995 fival 7310 nninfwlpoimlemg 7522 nninfwlpoimlemginf 7523 nninfwlpoim 7526 nninfinfwlpo 7527 genipv 7883 exfzdc 10676 infssuzex 10683 nninfdcex 10689 zproddc 12371 ennnfonelemrnh 13365 grppropd 13881 dvdsrpropdg 14563 znunit 15103 cnpfval 15454 plyval 15991 uhgrvtxedgiedgb 16622 wlkvtxedg 16842 |
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