User blog comment:A.J AL/Where does Death fit in?/@comment-109.66.36.57-20160528133306/@comment-34326521-20160528203904

The multiverse hypothesis (I refuse to call it theory in a serious manner for reasons I'll explain) is an interesting concept, supported by possible interpretations of the mathematics involved in describing many physical phenomena we experience daily.

However, mathematics is not physics. Physics makes observations and deduces the best approximation of reality based on the evidence. Mathematics starts with "1+1=2" and goes from there. Mathematics is a body of definitions, and not all mathematics has real-world applications (if it did, we'd be swimming in duplicating machines and have unlimited energy). In fact, I'm betting most of it doesn't.

As for logic, you must keep in mind that logic - all logic - is based on observations of the physical world. Logic isn't some independent thing we discovered; we merely observed nature in action and drew conclusions from it. Why is it logical that if A=B, and B=C, then A=C? Because we observed it. You can say that A=B means that A is identical to B in every regard, and so A is interchangeable with B, but that's still a physical property we observed. Long story short, logic is not independent of reality.