Theorem naim12i

Description: Constructor rule for -/\ . (Contributed by Anthony Hart, 2-Sep-2011)

	Ref	Expression
Hypotheses	naim12i.1	|- ( ph -> ps )
	naim12i.2	|- ( ch -> th )
	naim12i.3	|- ( ps -/\ th )
Assertion	naim12i	|- ( ph -/\ ch )

Proof

Step	Hyp	Ref	Expression
1		naim12i.1	|- ( ph -> ps )
2		naim12i.2	|- ( ch -> th )
3		naim12i.3	|- ( ps -/\ th )
4	1 3	naim1i	|- ( ph -/\ th )
5	2 4	naim2i	|- ( ph -/\ ch )