Theorem 3com23

Description: Commutation in antecedent. Swap 2nd and 3rd. (Contributed by NM, 28-Jan-1996) (Proof shortened by Wolf Lammen, 9-Apr-2022)

	Ref	Expression
Hypothesis	3exp.1	|- ( ( ph /\ ps /\ ch ) -> th )
Assertion	3com23	|- ( ( ph /\ ch /\ ps ) -> th )

Proof

Step	Hyp	Ref	Expression
1		3exp.1	|- ( ( ph /\ ps /\ ch ) -> th )
2	1	3comr	|- ( ( ch /\ ph /\ ps ) -> th )
3	2	3com12	|- ( ( ph /\ ch /\ ps ) -> th )