pm2.49 - New Foundations Explorer

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Theorem pm2.49 390

Description: Theorem *2.49 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)

**Assertion**
Ref	Expression
pm2.49	$\/$ $\/$

**Proof of Theorem pm2.49**
Step	Hyp	Ref	Expression
1		pm2.46 387	. 2 $\/$
2	1	olcd 382	1 $\/$ $\/$

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4 $\/$ wo 357

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 177 df-or 359

This theorem is referenced by: (None)