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Metamath Proof Explorer

Theorem pm2.24

Description: Theorem *2.24 of WhiteheadRussell p. 104. Its associated inference is pm2.24i . Commuted form of pm2.21 . (Contributed by NM, 3-Jan-2005)

		Ref	Expression
	Assertion	pm2.24	\|- ( ph -> ( -. ph -> ps ) )

Proof

Step	Hyp	Ref	Expression
1		pm2.21	\|- ( -. ph -> ( ph -> ps ) )
2	1	com12	\|- ( ph -> ( -. ph -> ps ) )