He has a deep interest in number theory.

Number theory is a branch of mathematics that primarily studies the properties of integers.

His nature is very kind, and he is liked by everyone.

He works in the marketing division of the company.

Let's calculate using integers.

I love mathematics.

He mainly eats vegetables.

He is conducting research on a new energy source.

He is researching about a new energy source.

He is the lord of this region.