维基百科:数学基础(zslcn周生烈编译摘注评) ... 危机 悖论
http://en.wikipedia.org/wiki/Foundations_of_mathematics
This page was last modified on 22 January 2014 at 02: ... ,到1888年 皮亚诺定义了 向量空间和线性映射的现代定义,向量 ... an absurdity inside the theory (such as 2 + 2 = 5), showing that this theory is inconsistent and must be ...