Theorem pm5.36 649

Description: Theorem *5.36 of [WhiteheadRussell] p. 125.

Assertion

Ref	Expression
pm5.36	|- ((ph /\ (ph <-> ps)) <-> (ps /\ (ph <-> ps)))

Proof of Theorem pm5.36

Step	Hyp	Ref	Expression
1		id 59	. 2 |- ((ph <-> ps) -> (ph <-> ps))
2	1	pm5.32ri 644	1 |- ((ph /\ (ph <-> ps)) <-> (ps /\ (ph <-> ps)))

Syntax hints:   <-> wb 146   /\ wa 223

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7

This theorem depends on definitions:  df-bi 147  df-an 225

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