Theorem neg1cn

Description: -1 is a complex number. (Contributed by David A. Wheeler, 7-Jul-2016)

	Ref	Expression
Assertion	neg1cn	⊢ - 1 ∈ ℂ

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	⊢ 1 ∈ ℂ
2	1	negcli	⊢ - 1 ∈ ℂ