It became popupar some years ago to picture mathematics in the form of a tree，usually a great oak tree.The roots of the tree were labeled with such titles as algebra ,plane geometry,trigonometry,analytic geometry,and irrational numbers.
參考答案:近几年来树形结构来描述数学分类越来越流行，通常是象一颗橡树形分布，从树根（就像一本书的目录一样）部开始分为代数,平面几何学，三角学，解析几何，和无理数等科目（这是我自己翻译的，没有用什么软件程序翻译）
