Theorem halfpire

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

	Ref	Expression
Assertion	halfpire	⊢ ( π / 2 ) ∈ ℝ

Proof

Step	Hyp	Ref	Expression
1		pire	⊢ π ∈ ℝ
2	1	rehalfcli	⊢ ( π / 2 ) ∈ ℝ