This job is very arduous.

This math problem is really difficult.

He is suffering from long hours of work.

I love mathematics.

Can you answer this question?

Discrete mathematics is an important field that forms the basis of computer science.

He is majoring in applied mathematics at university.

He is passionate about researching pure mathematics.

He is a world-famous mathematician.

Combinatorics is a branch of mathematics that studies combinations of things.