a mathematician
Examples
A mathematician is a machine for turning coffee into theorems.
Every good mathematician is at least half a philosopher, and every good philosopher is at least half a mathematician.
... it is true that a mathematician who is not somewhat of a poet, will never be a perfect mathematician.
Archimedes will be remembered when Aeschylus is forgotten, because languages die and mathematical ideas do not. "Immortality" may be a silly word, but probably a mathematician has the best chance of whatever it may mean.
I have hardly ever known a mathematician who was capable of reasoning.
Let no man who is not a Mathematician read the elements of my work.