Metamath Proof Explorer


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