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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 3446 | . . . 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 3442 |
| 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 3444 |
| This theorem is referenced by: spesbc 3834 exopxfr 5800 elres 5987 elid 6165 dfco2 6211 dfco2a 6212 dffv2 6937 abnex 7712 finacn 9972 ac6s2 10408 ptcmplem3 24010 ustn0 24177 hlimeui 31327 rexcom4f 32553 isrnsiga 34290 onvf1odlem1 35316 prdstotbnd 38042 ac6s3f 38419 moxfr 43046 eldioph2b 43117 kelac1 43417 cbvexsv 44900 sprid 47831 |
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