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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 3087 | . 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) | |
| 2 | vex 3454 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | biantrur 540 | . . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑)) |
| 4 | 3 | exbii 1880 | . 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 1811 ∈ wcel 2144 ∃wrex 3086 Vcvv 3450 |
| This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1827 ax-4 1841 ax-5 1942 ax-6 1999 ax-7 2040 ax-8 2146 ax-9 2154 ax-ext 2732 |
| This proof depends on definitions: df-bi 210 df-an 402 df-tru 1572 df-ex 1812 df-sb 2099 df-clab 2739 df-cleq 2752 df-clel 2835 df-rex 3087 df-v 3452 |
| This theorem is used by: spesbc 3828 exopxfr 5820 elres 6008 elid 6193 dfco2 6246 dfco2a 6247 dffv2 6981 abnex 7772 finacn 10133 ac6s2 10568 ptcmplem3 24379 ustn0 24546 hlimeui 31848 rexcom4f 33113 isrnsiga 34792 onvf1odlem1 35951 onprcf1of1ord 35975 vsmrep 36010 prdstotbnd 38822 ac6s3f 39197 moxfr 43797 eldioph2b 43868 kelac1 44159 cbvexsv 45624 sprid 48650 |
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