pm4.67 - Metamath Proof Explorer

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Theorem pm4.67 444

Description: Theorem *4.67 of [WhiteheadRussell] p. 120. (Contributed by NM, 3-Jan-2005.)

**Assertion**
Ref	Expression
pm4.67	$/\$

**Proof of Theorem pm4.67**
Step	Hyp	Ref	Expression
1		pm4.63 437	1 $/\$

Colors of variables: wff setvar class

Syntax hints:

wn 3

wi 4

wb 196 $/\$ wa 384

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-an 386

This theorem is referenced by: (None)