Theorem negicn

Description: -u _i is a complex number. (Contributed by David A. Wheeler, 7-Dec-2018)

	Ref	Expression
Assertion	negicn	⊢ - i ∈ ℂ

Proof

Step	Hyp	Ref	Expression
1		ax-icn	⊢ i ∈ ℂ
2		negcl	⊢ ( i ∈ ℂ → - i ∈ ℂ )
3	1 2	ax-mp	⊢ - i ∈ ℂ