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Theorem alequcom 1405
Description: Commutation law for identical variable specifiers. The antecedent and consequent are true when and are substituted with the same variable. Lemma L12 in [Megill] p. 445 (p. 12 of the preprint). (Contributed by NM, 5-Aug-1993.)
Ref Expression

Proof of Theorem alequcom
StepHypRef Expression
1 ax-10 1393 1
Colors of variables: wff set class
Syntax hints:   wi 4  wal 1240
This theorem was proved from axioms:  ax-10 1393
This theorem is referenced by:  alequcoms  1406  nalequcoms  1407  aev  1690
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