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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 3065 | . 2 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) | |
| 2 | vex 3436 | . . . 4 ⊢ 𝑥 ∈ V | |
| 3 | 2 | biantrur 535 | . . 3 ⊢ (𝜑 ↔ (𝑥 ∈ V ∧ 𝜑)) |
| 4 | 3 | exbii 1855 | . 2 ⊢ (∃𝑥𝜑 ↔ ∃𝑥(𝑥 ∈ V ∧ 𝜑)) |
| 5 | 1, 4 | bitr4i 279 | 1 ⊢ (∃𝑥 ∈ V 𝜑 ↔ ∃𝑥𝜑) |
| Colors of variables: wff setvar class |
| Syntax hints: ↔ wb 207 ∧ wa 396 ∃wex 1786 ∈ wcel 2119 ∃wrex 3064 Vcvv 3432 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1802 ax-4 1816 ax-5 1917 ax-6 1974 ax-7 2015 ax-8 2121 ax-9 2129 ax-ext 2712 |
| This theorem depends on definitions: df-bi 208 df-an 397 df-tru 1550 df-ex 1787 df-sb 2074 df-clab 2719 df-cleq 2732 df-clel 2815 df-rex 3065 df-v 3434 |
| This theorem is referenced by: spesbc 3821 exopxfr 5792 elres 5979 elid 6157 dfco2 6203 dfco2a 6204 dffv2 6929 abnex 7707 finacn 9970 ac6s2 10406 ptcmplem3 24044 ustn0 24211 hlimeui 31336 rexcom4f 32562 isrnsiga 34304 onvf1odlem1 35338 prdstotbnd 38168 ac6s3f 38545 moxfr 43148 eldioph2b 43219 kelac1 43515 cbvexsv 44998 sprid 47956 |
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