Theorem halfpire

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

	Ref	Expression
Assertion	halfpire	$$⊢\frac{\mathrm{\pi }}{2}\in ℝ$$

Proof

Step	Hyp	Ref	Expression
1		pire	$$⊢\mathrm{\pi }\in ℝ$$
2	1	rehalfcli	$$⊢\frac{\mathrm{\pi }}{2}\in ℝ$$