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Theorem bisymOLD 290
Description: Obsolete theorem as of 27-May-2019. (Contributed by Wolf Lammen, 14-May-2013.) (Proof modification is discouraged.) (New usage is discouraged.)
Ref Expression

Proof of Theorem bisymOLD
StepHypRef Expression
1 bi3 187 . 2
21bi3antOLD 289 1
Colors of variables: wff setvar class
Syntax hints:  ->wi 4  <->wb 184
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8
This theorem depends on definitions:  df-bi 185
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