Here is something Category-Theorists like: it is trivial, but not trivially trivial.

What a mathematical proof actually does is show that certain conclusions, such as the irrationality of , follow from certain premises, such as the principle of mathematical induction. The validity of these premises is an entirely independent matter which can safely be left to philosophers.

This attitude [the abstract method in mathematics] can be encapsulated in the following slogan: a mathematical object is what it does.

... the atlas is a manifold. This is a typical mathematician's use of the word "is", and should not be confused with the normal use.

Although the prime numbers are rigidly determined, they somehow feel like experimental data.

Here is something Category-Theorists like: it is trivial, but not trivially trivial.

Moreover, if one selects a problem, works on it in isolation for a few years and finally solves it, there is a danger, unless the problem is very famous, that it will no longer be regarded as all that significant.