How Mathematicians do it!

Real Analysts do it continuously.
Complex Analysts do it conformally and entirely.
Point Set Topologists do it openly, but compactly.
Combinatorists do it discretely.
Statisticians do it robustly.
Probabilists, we're not sure if they do it.
Logicians do it consistently.
Differential Topologists do it smoothly.
Algebraic Topologists do it manifold ways.
Algebraic Geometers scheme to do it without torsion.
Differential Geometers do it rigidly with torsion.
Numerical Analysts do it with arbitrary precision.
Applied Mathematicians do it everywhere.
Measure Theorists do it almost everywhere.
Ergodic Theorists do it dynamically.
Number Theorists do it in their prime.
Group Theorists simply do it.
Galois Theorists do it for love and honor.
Field Theorists do it with unity.
Set Theorists do it indeterminately.
Recursion Theorists do it undecidedly.
Proof Theorists do it correctly.
Model Theorists do it completely.
Constructivists do it directly.
Algebraists do it categorically.
Category Theorists do it polymorphously.
Linear Algebraists do it indiscriminately.
Search Theorists do it with infinitely divisible effort.
Operations Researchers maximize performance and minimize resources.
Software Analysts do it in RAM.
Software Engineers do it with user friendly I/O.
Pythagoras did it first.
Markov did it with chains.
Martingales do it without looking back.
Fermat did it, but can't prove it.
Norbert Wiener did it prodigiously.
Gauss did it better than anyone.

Cryptographers do it secretly! :) (by Vesko)

Originally from http://hischer.de/uds/aphorism/howmath1.htm