Dude, seriously

I thought you guys were just being facetious, and I was ready to laugh along but it turns out you were serious.

Parallel universes really do exist, according to a mathematical
discovery by Oxford scientists that sweeps away one of the key
objections to the mind boggling and controversial idea.

Mathematics aint reality. In math, you can divide a pizza into smaller and smaller slices: 1/2, 1/4, 1/8, 1/16, ... 1/n, where n is some infinitely large number, the pizza slice getting smaller and smaller and approaches zero. Try doing that to a real pizza. You'll reach a pizza that is one 'pizza atom' thin (assuming that you can get a knife less than a 'pizza atom' thin), and guess what happens when you slice that? Youll release energy in the nucleus and you won't be able to divide it anymore because it'll be all over the place.