The only teaching that a professor can give, in my opinion, is that of thinking in front of his students..

In my opinion a mathematician, in so far as he is a mathematician, need not preoccupy himself with philosophy-an opinion, moreover, which has been ex….

... if one were to refuse to have direct, geometric, intuitive insights, if one were reduced to pure logic, which does not permit a choice among ever….

Mathematicians have never been in full agreement on their science, though it is said to be the science of self-evident verities -- absolute, indisput….