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Theorem exa1 1661
Description: Add an antecedent in an existentially quantified formula. (Contributed by BJ, 6-Oct-2018.)
Assertion
Ref Expression
exa1

Proof of Theorem exa1
StepHypRef Expression
1 ax-1 6 . 2
21eximi 1656 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  E.wex 1612
This theorem is referenced by:  19.35  1687
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1618  ax-4 1631
This theorem depends on definitions:  df-bi 185  df-ex 1613
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