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的导师普罗克洛斯Proclus410-485在著作《几何学发展概要》中述说泰勒斯发现了下述几何命题并给于证明圆的直径将圆平分等腰三角形的两个底角相等两直线相交对顶角相等角边角对应相等的两个三角形全等。虽然泰勒斯的证明还是非常原始的但是他所述说的命题本身却已经是相当抽象、相当规范了这些命题依然是当今初中阶段数学教学的重要内容。但是几何学的真正成为一门学科还是从欧几里得开始的。
话题25 欧几里得《几何原本》
欧几里得的《几何原本》对于几何学、乃至数学的贡献,几乎怎么评价都不过分,直到十九世纪末叶,欧几里得几乎与几何学还是同义词。