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