pm2.47 - Intuitionistic Logic Explorer

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Theorem pm2.47 752

Description: Theorem *2.47 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)

**Assertion**
Ref	Expression
pm2.47	$\/$ $\/$

**Proof of Theorem pm2.47**
Step	Hyp	Ref	Expression
1		pm2.45 750	. 2 $\/$
2	1	orcd 745	1 $\/$ $\/$

Colors of variables: wff set class

This proof depends on syntax axioms:

wn 3

wi 4 $\/$ wo 720

This proof depends on axioms: ax-mp 5 ax-1 6 ax-2 7 ax-ia1 106 ax-in1 623 ax-in2 624 ax-io 721

This proof depends on definitions: df-bi 117

This theorem is used by: (None)