He wrote a new paper on string theory.

String theory is a branch of physics that is a theory for understanding the basic structure of the universe.

He is known as an excellent theoretician.

Graph theory is a branch of mathematics that studies mathematical structures called graphs.

Information theory is a field of study that mathematically analyzes the amount of information and the efficiency of its transmission.

Theoretically, this experiment should succeed.

The depressed cowry lives quietly at the bottom of the sea.

He likes to take a walk in the park at dusk.

Einstein proposed the theory of relativity.

He is an expert in theoretical physics.