Theorem pine0

Description: _pi is nonzero. (Contributed by SN, 25-Apr-2025)

	Ref	Expression
Assertion	pine0	|- _pi =/= 0

Proof

Step	Hyp	Ref	Expression
1		pire	|- _pi e. RR
2		pipos	|- 0 < _pi
3	1 2	gt0ne0ii	|- _pi =/= 0