A polytope is an important concept in geometry.

He is good at solving geometry problems.

This concept is difficult.

Health is very important.

His opinion is very important.

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.