Green's theorem is one of the fundamental theorems in vector analysis.

This theorem forms the foundation of mathematics.

I learned about Pythagoras' theorem in math class.

Fundamental knowledge of mathematics is necessary for daily life.

Understanding vector fields is an important concept in physics.

A vector product is an operation that generates a new vector from two vectors.

It is important to learn the basic grammar of Japanese.

He ate one apple.

Mr. Greene is my best friend.

His favorite color is green.