# Why is “Poincaré conjecture” called a conjecture instead of “Poincaré Theorem” when it has already been solved?

"In mathematics, a conjecture is a conclusion or proposition based on incomplete information, for which no proof has been found." This is what conjecture is according to Wikipedia.

• Perhaps because Poincare did not prove it. Perelman did but didn't really "claim" it (in part because the proof was sort of "on the shoulders of giants") so the name Perelman's Theorem never really came into prominence. That said this is what it was called for quite some time. As those that knew it as a conjecture leave the field, its name will probably change. – Ian Sep 6 '17 at 1:44