I am studying Japanese.

He is known as a person with learning.

He tore the paper into small fragments.

He solved a large number of problems.

He is a famous author and a person who is respected by many people.

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

He is a world-famous mathematician.

There is no room for doubt in his words.

I am studying Japanese.

We are going on a trip together.