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Theorem equs3 1734
Description: Lemma used in proofs of substitution properties. (Contributed by NM, 10-May-1993.)
Assertion
Ref Expression
equs3

Proof of Theorem equs3
StepHypRef Expression
1 alinexa 1663 . 2
21con2bii 332 1
Colors of variables: wff setvar class
Syntax hints:  -.wn 3  ->wi 4  <->wb 184  /\wa 369  A.wal 1393  E.wex 1612
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-an 371  df-ex 1613
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