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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 3091 | . 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) | |
| 2 | vex 3458 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | biantrur 540 | . . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑)) |
| 4 | 3 | exbii 1881 | . 2 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) |
| 5 | 1, 4 | bitr4i 281 | 1 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑) |
| Colors of variables: wff setvar class |
| This proof depends on syntax axioms: ↔ wb 209 ∧ wa 401 ∃wex 1812 ∈ wcel 2147 ∃wrex 3090 Vcvv 3454 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1828 ax-4 1842 ax-5 1945 ax-6 2002 ax-7 2043 ax-8 2149 ax-9 2157 ax-ext 2735 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1573 df-ex 1813 df-sb 2102 df-clab 2742 df-cleq 2755 df-clel 2839 df-rex 3091 df-v 3456 |
| This theorem is used by: spesbc 3833 elvv 5733 exopxfr 5831 elres 6027 elid 6212 dfco2 6265 dfco2a 6266 dffv2 7011 abnex 7803 finacn 10168 ac6s2 10603 ptcmplem3 24428 ustn0 24595 hlimeui 31899 rexcom4f 33164 isrnsiga 34856 onvf1odlem1 36072 onprcf1of1ord 36096 vsmrep 36131 bj-elres 38184 prdstotbnd 38994 ac6s3f 39369 moxfr 43969 eldioph2b 44040 kelac1 44331 cbvexsv 45790 sprid 48829 |
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