That's a very narrow look at logic, this sort of thinking makes people think that everyone on the planet is rational, which they are not. If you are just talking about mathmatics then yes this is correct, however, when speaking of anything that does not have a exact value then logic gets fuzzy...

Asking what logic is is like asking what the meaning of life is, every person you ask will say something different. You have to find out what logic means to you personally and no one can help you with that.