| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| 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 2744 | . 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 |
| Syntax hints: → wi 4 ↔ wb 105 = wceq 1398 ∃wrex 2523 |
| 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-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-ext 2216 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1812 df-cleq 2227 df-clel 2230 df-nfc 2375 df-rex 2528 |
| This theorem is referenced by: rexeqtrdv 2752 rexeqtrrdv 2754 rexeqbidv 2760 rexeqbidva 2762 fnunirn 5946 cbvexfo 5965 fival 7270 nninfwlpoimlemg 7479 nninfwlpoimlemginf 7480 nninfwlpoim 7483 nninfinfwlpo 7484 genipv 7840 exfzdc 10608 infssuzex 10615 nninfdcex 10621 zproddc 12290 ennnfonelemrnh 13251 grppropd 13814 dvdsrpropdg 14377 znunit 14919 cnpfval 15172 plyval 15709 uhgrvtxedgiedgb 16250 wlkvtxedg 16470 |
| Copyright terms: Public domain | W3C validator |