His artwork is characterized by abstract expression.

He is good at abstracting the abstract points of the problem.

Abstract algebra is a branch of mathematics that studies algebraic structures.

He has the ability to change into a wolf.

He is known as a person with learning.

Euclidean geometry forms the foundation of geometry.

He is an expert in algebraic geometry.

He is an expert in topology.

I am learning the basic concepts of differential geometry.

Computational geometry is an important field of computer science.