Question

What part of physics is theoretical physics?

Answer 1

your answer is quantum mechanics

Answer 2

^_^

Physics is the act of matching a computer program output to a natural system, so that aspects of the physical system are matched by the computer program...

Any predictive program works, but the fundamental physics is ambitious, in that it wishes to be able to match a computer program to any conceivable situation,..so that it can reproduce the results of the situation as best possible...

#Keep Smiling!..