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Metamath Proof Explorer

Theorem halfpire

Description: _pi / 2 is real. (Contributed by David Moews, 28-Feb-2017)

Ref Expression
Assertion halfpire 
|- ( _pi / 2 ) e. RR

Proof

Step Hyp Ref Expression
1 pire 
 |-  _pi e. RR
2 1 rehalfcli 
 |-  ( _pi / 2 ) e. RR