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Theorem bj-alexbiex 36642
Description: Adding a second quantifier over the same variable is a transparent operation, (∀∃ case). (Contributed by BJ, 20-Oct-2019.)
Assertion
Ref Expression
bj-alexbiex (∀𝑥𝑥𝜑 ↔ ∃𝑥𝜑)

Proof of Theorem bj-alexbiex
StepHypRef Expression
1 nfe1 2146 . 2 𝑥𝑥𝜑
2119.3 2198 1 (∀𝑥𝑥𝜑 ↔ ∃𝑥𝜑)
Colors of variables: wff setvar class
Syntax hints:  wb 206  wal 1533  wex 1774
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1790  ax-4 1804  ax-5 1906  ax-6 1963  ax-7 2003  ax-10 2137  ax-12 2173
This theorem depends on definitions:  df-bi 207  df-ex 1775  df-nf 1779
This theorem is referenced by: (None)
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