Theorem exp41

Description: An exportation inference. (Contributed by NM, 26-Apr-1994)

	Ref	Expression
Hypothesis	exp41.1	|- ( ( ( ( ph /\ ps ) /\ ch ) /\ th ) -> ta )
Assertion	exp41	|- ( ph -> ( ps -> ( ch -> ( th -> ta ) ) ) )

Proof

Step	Hyp	Ref	Expression
1		exp41.1	|- ( ( ( ( ph /\ ps ) /\ ch ) /\ th ) -> ta )
2	1	ex	|- ( ( ( ph /\ ps ) /\ ch ) -> ( th -> ta ) )
3	2	exp31	|- ( ph -> ( ps -> ( ch -> ( th -> ta ) ) ) )