He has a very passive personality.

This math problem needs to be solved using the correct operator.

He is good at arithmetic operations.

This processor is very fast.

He wants to learn deeply about set theory.

The concept of the absolute complement plays an important role in set theory.

In math class, we learned about the concept of union.

In math class, I learned about the concept of intersection.

In math class, the teacher explained the concept of relative complement.

In math class, we learned about the intersection.