Theorem 1pneg1e0

Description: 1 + -u 1 is 0. (Contributed by David A. Wheeler, 8-Dec-2018)

	Ref	Expression
Assertion	1pneg1e0	⊢ ( 1 + - 1 ) = 0

Proof

Step	Hyp	Ref	Expression
1		ax-1cn	⊢ 1 ∈ ℂ
2	1	negidi	⊢ ( 1 + - 1 ) = 0