Theorem negcli

Description: Closure law for negative. (Contributed by NM, 26-Nov-1994)

	Ref	Expression
Hypothesis	negidi.1	|- A e. CC
Assertion	negcli	|- -u A e. CC

Proof

Step	Hyp	Ref	Expression
1		negidi.1	|- A e. CC
2		negcl	|- ( A e. CC -> -u A e. CC )
3	1 2	ax-mp	|- -u A e. CC