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Theorem eqvf 3491
Description: The universe contains every set. (Contributed by BJ, 15-Jul-2021.)
Hypothesis
Ref Expression
eqvf.1 𝑥𝐴
Assertion
Ref Expression
eqvf (𝐴 = V ↔ ∀𝑥 𝑥𝐴)

Proof of Theorem eqvf
StepHypRef Expression
1 eqvf.1 . . 3 𝑥𝐴
2 nfcv 2905 . . 3 𝑥V
31, 2cleqf 2934 . 2 (𝐴 = V ↔ ∀𝑥(𝑥𝐴𝑥 ∈ V))
4 vex 3484 . . . 4 𝑥 ∈ V
54tbt 369 . . 3 (𝑥𝐴 ↔ (𝑥𝐴𝑥 ∈ V))
65albii 1819 . 2 (∀𝑥 𝑥𝐴 ↔ ∀𝑥(𝑥𝐴𝑥 ∈ V))
73, 6bitr4i 278 1 (𝐴 = V ↔ ∀𝑥 𝑥𝐴)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wal 1538   = wceq 1540  wcel 2108  wnfc 2890  Vcvv 3480
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2007  ax-8 2110  ax-9 2118  ax-11 2157  ax-12 2177  ax-ext 2708
This theorem depends on definitions:  df-bi 207  df-an 396  df-or 849  df-tru 1543  df-ex 1780  df-nf 1784  df-sb 2065  df-clab 2715  df-cleq 2729  df-clel 2816  df-nfc 2892  df-v 3482
This theorem is referenced by: (None)
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