形の見分け方と数学の視点
How to distinguish different shapes, and Mathematical point of view

数学を創る-数学者達の挑戦(学術俯瞰講義)
第12回 形の見分け方と数学の視点
坪井俊
Creating Mathematics - The Challenge of Mathematics (Global Focus on Knowledge)
#12 How to distinguish different shapes, and Mathematical point of view
Takashi Tsuboi