Description: -1 is a real number. (Contributed by David A. Wheeler, 5-Dec-2018)
Ref | Expression | ||
---|---|---|---|
Assertion | neg1rr | $${\u22a2}-1\in \mathbb{R}$$ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | 1re | $${\u22a2}1\in \mathbb{R}$$ | |
2 | 1 | renegcli | $${\u22a2}-1\in \mathbb{R}$$ |