pm4.25 - Metamath Proof Explorer

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Theorem pm4.25 537

Description: Theorem *4.25 of [WhiteheadRussell] p. 117. (Contributed by NM, 3-Jan-2005.)

**Assertion**
Ref	Expression
pm4.25	$\/$

**Proof of Theorem pm4.25**
Step	Hyp	Ref	Expression
1		oridm 536	. 2 $\/$
2	1	bicomi 214	1 $\/$

Colors of variables: wff setvar class

Syntax hints:

wb 196 $\/$ wo 383

This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8

This theorem depends on definitions: df-bi 197 df-or 385

This theorem is referenced by: brbtwn2 25785 ifpid1g 37839 uneqsn 38321