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

He has the ability to change into a wolf.

His artwork is characterized by abstract expression.

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

He is known as a person with learning.

Riemannian geometry is a field of mathematics that studies geometric objects such as curves and surfaces.

He is an expert in topology.

He is an expert in algebraic geometry.

Computational geometry is an important field of computer science.

I am learning the basic concepts of differential geometry.