Metamath Proof Explorer

Theorem negpicn

Description: -u _pi is a real number. (Contributed by David A. Wheeler, 8-Dec-2018)

Ref Expression
Assertion negpicn 
|- -u _pi e. CC

Proof

Step Hyp Ref Expression
1 picn 
 |-  _pi e. CC
2 1 negcli 
 |-  -u _pi e. CC