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Metamath Proof Explorer

Theorem negpicn

Description: -u _pi is a real number. (Contributed by David A. Wheeler, 8-Dec-2018)

Ref Expression
Assertion negpicn - π ∈ ℂ

Proof

Step Hyp Ref Expression
1 picn ⊢ π ∈ ℂ
2 1 negcli ⊢ - π ∈ ℂ