fact: Definition complex_triangle (a b c : C) (z : C) := exists (a' b' c' : R), 0 <= a' /\ 0 <= b' /\ 0 <= c' /\ (a' + b' + c' = 1)%R /\ z = scal a' a + scal b' b + scal c' c.
imports: Coq(Reals ssreflect) Coquelicot(Coquelicot)