Theorem bnj1235

Description: First-order logic and set theory. (Contributed by Jonathan Ben-Naim, 3-Jun-2011) (New usage is discouraged.)

	Ref	Expression
Hypothesis	bnj1235.1	|- ( ph <-> ( ps /\ ch /\ th /\ ta ) )
Assertion	bnj1235	|- ( ph -> ch )

Proof

Step	Hyp	Ref	Expression
1		bnj1235.1	|- ( ph <-> ( ps /\ ch /\ th /\ ta ) )
2		id	|- ( ch -> ch )
3	1 2	bnj770	|- ( ph -> ch )