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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 3069 | . 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) | |
2 | vex 3426 | . . . 4 ⊢ 𝑥 ∈ V | |
3 | 2 | biantrur 530 | . . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑)) |
4 | 3 | exbii 1851 | . 2 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) |
5 | 1, 4 | bitr4i 277 | 1 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑) |
Colors of variables: wff setvar class |
Syntax hints: ↔ wb 205 ∧ wa 395 ∃wex 1783 ∈ wcel 2108 ∃wrex 3064 Vcvv 3422 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1799 ax-4 1813 ax-5 1914 ax-6 1972 ax-7 2012 ax-8 2110 ax-9 2118 ax-ext 2709 |
This theorem depends on definitions: df-bi 206 df-an 396 df-tru 1542 df-ex 1784 df-sb 2069 df-clab 2716 df-cleq 2730 df-clel 2817 df-rex 3069 df-v 3424 |
This theorem is referenced by: spesbc 3811 exopxfr 5741 elres 5919 elid 6091 dfco2 6138 dfco2a 6139 dffv2 6845 abnex 7585 finacn 9737 ac6s2 10173 ptcmplem3 23113 ustn0 23280 hlimeui 29503 rexcom4f 30720 isrnsiga 31981 prdstotbnd 35879 ac6s3f 36256 moxfr 40430 eldioph2b 40501 kelac1 40804 cbvexsv 42056 sprid 44814 |
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