I am going to substantiate this theory.

The equivalence of the two theories was proven by the mathematician.

Freud's theories revolutionized the field of psychology.

Scientists use experiments to demonstrate their theories.

This experiment provides demonstrative evidence of the theory.

The theory is widely accepted in the scientific community.

The professor attempted to elucidate the complex theory.

I will disprove his theory with solid evidence.

The professor provided a clear elucidation of the complex theory.

The concept of evolution is a derivative of Charles Darwin's theory.