| Intuitionistic Logic Explorer |
< Previous
Next >
Nearby theorems |
||
| Mirrors > Home > ILE Home > Th. List > ceqsexgv | GIF version | ||
| Description: Elimination of an existential quantifier, using implicit substitution. (Contributed by NM, 29-Dec-1996.) |
| Ref | Expression |
|---|---|
| ceqsexgv.1 | ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) |
| Ref | Expression |
|---|---|
| ceqsexgv | ⊢ (𝐴 ∈ 𝑉 → (∃𝑥(𝑥 = 𝐴 ∧ 𝜑) ↔ 𝜓)) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | nfv 1577 | . 2 ⊢ Ⅎ𝑥𝜓 | |
| 2 | ceqsexgv.1 | . 2 ⊢ (𝑥 = 𝐴 → (𝜑 ↔ 𝜓)) | |
| 3 | 1, 2 | ceqsexg 2935 | 1 ⊢ (𝐴 ∈ 𝑉 → (∃𝑥(𝑥 = 𝐴 ∧ 𝜑) ↔ 𝜓)) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 ∧ wa 104 ↔ wb 105 = wceq 1398 ∃wex 1541 ∈ 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-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 2213 |
| This theorem depends on definitions: df-bi 117 df-tru 1401 df-nf 1510 df-sb 1811 df-clab 2218 df-cleq 2224 df-clel 2227 df-nfc 2364 df-v 2805 |
| This theorem is referenced by: ceqsrexv 2937 clel3g 2941 elxp4 5231 elxp5 5232 dmfco 5723 fndmdif 5761 fndmin 5763 fmptco 5821 rexrnmpo 6147 brtpos2 6460 xpsnen 7048 prarloc 7766 pceu 12929 4sqlem12 13036 znleval 14729 metrest 15297 |
| Copyright terms: Public domain | W3C validator |