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.

Please read this instruction manual carefully before using the product.

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

Einstein proposed the theory of relativity.

He is an expert in theoretical physics.

We should always remember the power of Kannon in difficult times.

Special relativity is one of the fundamental theories of physics.

General relativity is a theory of physics proposed by Einstein.