Theorem eel021old

Description: el021old without virtual deductions. (Contributed by Alan Sare, 13-Jun-2015) (Proof modification is discouraged.) (New usage is discouraged.)

	Ref	Expression
Hypotheses	eel021.1	|- ph
	eel021.2	|- ( ( ps /\ ch ) -> th )
	eel021.3	|- ( ( ph /\ th ) -> ta )
Assertion	eel021old	|- ( ( ps /\ ch ) -> ta )

Proof

Step	Hyp	Ref	Expression
1		eel021.1	|- ph
2		eel021.2	|- ( ( ps /\ ch ) -> th )
3		eel021.3	|- ( ( ph /\ th ) -> ta )
4	1 2 3	sylancr	|- ( ( ps /\ ch ) -> ta )