Theorem biancomi 270

Description: Commuting conjunction in a biconditional. (Contributed by Peter Mazsa, 17-Jun-2018.)

Hypothesis

Ref	Expression
biancomi.1	|- ( ph <-> ( ch /\ ps ) )

Assertion

Ref	Expression
biancomi	|- ( ph <-> ( ps /\ ch ) )

Proof of Theorem biancomi

Step	Hyp	Ref	Expression
1		biancomi.1	. 2 |- ( ph <-> ( ch /\ ps ) )
2		ancom 266	. 2 |- ( ( ps /\ ch ) <-> ( ch /\ ps ) )
3	1, 2	bitr4i 187	1 |- ( ph <-> ( ps /\ ch ) )

This proof depends on syntax axioms:   /\ wa 104   <-> wb 105

This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108

This proof depends on definitions:  df-bi 117

This theorem is used by:  restidsing  5119  lgsquadlem1  16208  lgsquadlem2  16209