Theorem intnanr

Description: Introduction of conjunct inside of a contradiction. (Contributed by NM, 3-Apr-1995)

	Ref	Expression
Hypothesis	intnan.1	|- -. ph
Assertion	intnanr	|- -. ( ph /\ ps )

Proof

Step	Hyp	Ref	Expression
1		intnan.1	|- -. ph
2		simpl	|- ( ( ph /\ ps ) -> ph )
3	1 2	mto	|- -. ( ph /\ ps )