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Theorem ska12 240
Description: Soundness theorem for Kalmbach's quantum propositional logic axiom KA12.
Assertion
Ref Expression
ska12 ((a == b) == (b == a)) = 1

Proof of Theorem ska12
StepHypRef Expression
1 bicom 96 . 2 (a == b) = (b == a)
21bi1 118 1 ((a == b) == (b == a)) = 1
Colors of variables: term
Syntax hints:   = wb 1   == tb 5  1wt 8
This theorem was proved from axioms:  ax-a1 30  ax-a2 31  ax-a5 34  ax-r1 35  ax-r2 36  ax-r4 37  ax-r5 38
This theorem depends on definitions:  df-b 39  df-a 40  df-t 41  df-f 42
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