Relationship between math and physics

XKCD had a comment about the purity of the subject matter:

A similar joke I have heard before:

Sociologists want to be psychologists, because if you understand the brain you can understand society.

Psychologists want to be biologists, because if you understand life you can understand the brain.

Biologists want to be chemists, because if you understand matter you understand life.

Chemists want to be physicists, because if you understand the universe you understand matter.

Physicists want to be God.

God wants to be a mathematician.

Comment by Wingy.

Talk Like a Physicist