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Theorem pm5.18im 1273
Description: One direction of pm5.18dc 776, which holds for all propositions, not just decidable propositions. (Contributed by Jim Kingdon, 10-Mar-2018.)
Assertion
Ref Expression
pm5.18im

Proof of Theorem pm5.18im
StepHypRef Expression
1 pm5.19 621 . 2
2 bibi1 229 . . 3
32notbid 591 . 2
41, 3mpbiri 157 1
Colors of variables: wff set class
Syntax hints:   wn 3   wi 4   wb 98
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 99  ax-ia2 100  ax-ia3 101  ax-in1 544  ax-in2 545
This theorem depends on definitions:  df-bi 110
This theorem is referenced by:  xornbi  1274
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