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| Mirrors > Home > MPE Home > Th. List > rexv | Structured version Visualization version GIF version | ||
| Description: An existential quantifier restricted to the universe is unrestricted. (Contributed by NM, 26-Mar-2004.) |
| Ref | Expression |
|---|---|
| rexv | ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-rex 3063 | . 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) | |
| 2 | vex 3434 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | biantrur 530 | . . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑)) |
| 4 | 3 | exbii 1850 | . 2 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) |
| 5 | 1, 4 | bitr4i 278 | 1 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 206 ∧ wa 395 ∃wex 1781 ∈ wcel 2114 ∃wrex 3062 Vcvv 3430 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-tru 1545 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-rex 3063 df-v 3432 |
| This theorem is referenced by: spesbc 3821 exopxfr 5792 elres 5979 elid 6157 dfco2 6203 dfco2a 6204 dffv2 6929 abnex 7704 finacn 9963 ac6s2 10399 ptcmplem3 24029 ustn0 24196 hlimeui 31326 rexcom4f 32552 isrnsiga 34273 onvf1odlem1 35301 prdstotbnd 38129 ac6s3f 38506 moxfr 43138 eldioph2b 43209 kelac1 43509 cbvexsv 44992 sprid 47946 |
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