Theorem neg1rr

Description: -1 is a real number. (Contributed by David A. Wheeler, 5-Dec-2018)

	Ref	Expression
Assertion	neg1rr	⊢ - 1 ∈ ℝ

Proof

Step	Hyp	Ref	Expression
1		1re	⊢ 1 ∈ ℝ
2	1	renegcli	⊢ - 1 ∈ ℝ