Wikipedia真是好物。最近數學界在大躍進嘛？看到費馬最後定理等等這些不得了的東西一個個被破解真是驚訝又敬佩啊。就是很適合用大変ですね的那種感覺…真是…不得了啊…

[部份重點節錄]
As of 2006, a consensus amongst experts has concluded that recent work by Grigori Perelman in 2003 has disposed of this question, after nearly a century.
Poincaré conjecture:
Every simply connected closed (i.e. compact and without boundary) 3-manifold is homeomorphic to a 3-sphere.

抱歉要用白話文說明Poincaré猜想實在有點困難=v=;; 先講完什麼是3-manifold再講homeomorphic…應該不是天黑就辦得到吧…應該還是有辦法說得簡單一點,不過我功力好像不夠/__\