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Related theorems GIF version |
| Description: Elimination of an existential quantifier, using implicit substitution. |
| Ref | Expression |
|---|---|
| ceqsexv.1 | ⊢ A ∈ V |
| ceqsexv.2 | ⊢ (x = A → (φ ↔ ψ)) |
| Ref | Expression |
|---|---|
| ceqsexv | ⊢ (∃x(x = A ∧ φ) ↔ ψ) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | ax-17 925 | . 2 ⊢ (ψ → ∀xψ) | |
| 2 | ceqsexv.1 | . 2 ⊢ A ∈ V | |
| 3 | ceqsexv.2 | . 2 ⊢ (x = A → (φ ↔ ψ)) | |
| 4 | 1, 2, 3 | ceqsex 1370 | 1 ⊢ (∃x(x = A ∧ φ) ↔ ψ) |
| Colors of variables: wff set class |
| Syntax hints: → wi 2 ↔ wb 127 ∧ wa 196 ∃wex 678 = wceq 1091 ∈ wcel 1092 Vcvv 1348 |
| This theorem is referenced by: gencbvex 1372 clel3 1375 euxfr2 1435 vsbcint 1438 zfaus 1480 eqvinop 1901 iunxsn 2034 cbvop 2473 iss 2599 imai 2613 elimasn 2617 intirr 2628 elxp4 2640 elxp5 2641 coi1 2665 fcoi1 2765 fcoi2 2766 fv2 2828 dmfco 2864 fvco 2865 ec2 3203 snec 3232 mapsnen 3334 xpsnen 3339 xpassen 3344 aceq5lem1 3558 aceq5lem2 3559 aceq5lem3 3560 cf0 3705 distrlem1pr 3921 ltexprlem4 3939 infxpidmlem8 4940 |
| This theorem was proved from axioms: ax-1 3 ax-2 4 ax-3 5 ax-mp 6 ax-4 673 ax-5 674 ax-6 675 ax-gen 677 ax-9 799 ax-12 802 ax-17 925 ax-ext 1074 |
| This theorem depends on definitions: df-bi 128 df-an 198 df-ex 679 df-sb 853 df-clab 1093 df-cleq 1097 df-clel 1099 df-v 1349 |