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

He is an expert in algebraic geometry.

I studied linear algebra at university.

He is good at algebra.

He is known as a person with learning.

There was a long queue in front of the movie theater.

People were forming a line from early morning to buy concert tickets.

He is an expert in orthoepy, teaching pronunciation.

It is important to understand the importance of health.

I (humble) agree with your proposal.