pm2.51 - Metamath Proof Explorer

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Theorem pm2.51 153

Description: Theorem *2.51 of [WhiteheadRussell] p. 107. (Contributed by NM, 3-Jan-2005.)

**Assertion**
Ref	Expression
pm2.51

**Proof of Theorem pm2.51**
Step	Hyp	Ref	Expression
1		ax-1 6	. . 3
2	1	con3i 135	. 2
3	2	a1d 25	1

Colors of variables: wff setvar class

Syntax hints: -.wn 3 ->wi 4

This theorem is referenced by: pm5.12 885

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