Metamath Proof Explorer

Theorem neg1rr

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

Ref Expression
Assertion neg1rr 
|- -u 1 e. RR

Proof

Step Hyp Ref Expression
1 1re 
 |-  1 e. RR
2 1 renegcli 
 |-  -u 1 e. RR