The door won't open because this hinge is broken.

I want to go to Sweden.

He is passionate about researching pure mathematics.

Recently, I've been feeling heavy-headed due to lack of sleep.

I look forward to going to the sea for a swim with my family during the summer vacation.

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

Abstract algebra is a field of mathematics that studies algebraic structures in an abstract way.

This eigenfunction is one of the fundamental concepts of quantum mechanics.

He makes a living through rice work.

The Kingdom of Swaziland is a small country in Africa.