On Logic and Alternate Universes

[bennyboy]

"But 2 + 2 will always equal 4 no matter what." - no, that is a bare assertion. 2 + 2 didn't have to equal 4 in this universe. The mere roll of the dice made it so.

Ok, this one I'm very iffy about.

You are iffy because it's a dumb idea.  That's because 2+2=4 isn't a rule or a set property-- it's simply a label.  If there were a universe where math worked differently, you'd just have different labels for whatever THAT reality was.  In any universe where there are 2 and 2, and the capacity to add, it will always be 4-- whatever you choose to call it. And if 2 + 2 = magic unicorn, then magic unicorn is just another representation of "4."