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Theorem 3bior1fand 1291
Description: A disjunction is equivalent to a threefold disjunction with single falsehood of a conjunction. (Contributed by Alexander van der Vekens, 8-Sep-2017.)
Hypothesis
Ref Expression
3biorfd.1  |-  ( ph  ->  -.  th )
Assertion
Ref Expression
3bior1fand  |-  ( ph  ->  ( ( ch  \/  ps )  <->  ( ( th 
/\  ta )  \/  ch  \/  ps ) ) )

Proof of Theorem 3bior1fand
StepHypRef Expression
1 3biorfd.1 . . 3  |-  ( ph  ->  -.  th )
21intnanrd 885 . 2  |-  ( ph  ->  -.  ( th  /\  ta ) )
323bior1fd 1290 1  |-  ( ph  ->  ( ( ch  \/  ps )  <->  ( ( th 
/\  ta )  \/  ch  \/  ps ) ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    <-> wb 178    \/ wo 359    /\ wa 360    \/ w3o 936
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8
This theorem depends on definitions:  df-bi 179  df-or 361  df-an 362  df-3or 938
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