there is hardly any theory which is more elementary than linear algebra in spite of the fact that generations of professors and textbook writers have obscured its simplicity by preposterous calculations with matrices. - Jean Dieudonné 很难再有比线性代数更基础的理论了,而历代的数学教师和教科书作 ...
We know that mathematicians care no more for logic than logicians for mathematics. The two eyes of exact science are mathematics and logic, the mathematical sect puts out the logical eye, the logical sect puts out the mathematical eye; each believing that it sees better with one eye than with two. ...