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Theorem bj-alexbiex 32815
Description: Adding a second quantifier is a tranparent operation, (∀∃ case). (Contributed by BJ, 20-Oct-2019.)
Assertion
Ref Expression
bj-alexbiex (∀𝑥𝑥𝜑 ↔ ∃𝑥𝜑)

Proof of Theorem bj-alexbiex
StepHypRef Expression
1 nfe1 2067 . 2 𝑥𝑥𝜑
2119.3 2107 1 (∀𝑥𝑥𝜑 ↔ ∃𝑥𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 196  wal 1521  wex 1744
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-10 2059  ax-12 2087
This theorem depends on definitions:  df-bi 197  df-ex 1745  df-nf 1750
This theorem is referenced by: (None)
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