I think it's accurate to say that.

This angle is true.

This answer cannot be said to be correct.

We cannot say that this theory is correct a priori.

This theory has an a priori nature.

He is good at explaining that theory.

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

Theoretically, this experiment should succeed.

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

He is known as an excellent theoretician.