Theorem pm4.24 433

Description: Theorem *4.24 of [WhiteheadRussell] p. 117.

Assertion

Ref	Expression
pm4.24	|- (ph <-> (ph /\ ph))

Proof of Theorem pm4.24

Step	Hyp	Ref	Expression
1		anidm 432	. 2 |- ((ph /\ ph) <-> ph)
2	1	bicomi 172	1 |- (ph <-> (ph /\ ph))

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

This theorem is referenced by:  pm5.74 583  nicodraw 952  euan 1428  efsubt 7371  cncnplem4 7777  filintf 10569

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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