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Metamath Proof Explorer

Theorem pirp

Description: _pi is a positive real. (Contributed by Glauco Siliprandi, 11-Dec-2019)

Ref Expression
Assertion pirp 
|- _pi e. RR+

Proof

Step Hyp Ref Expression
1 pire 
 |-  _pi e. RR
2 pipos 
 |-  0 < _pi
3 1 2 elrpii 
 |-  _pi e. RR+