Theorem neg1ne0

Description: -1 is nonzero. (Contributed by David A. Wheeler, 8-Dec-2018)

	Ref	Expression
Assertion	neg1ne0	|- -u 1 =/= 0

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	|- 1 e. CC
2		ax-1ne0	|- 1 =/= 0
3	1 2	negne0i	|- -u 1 =/= 0