This is obviously one for the experts, but I find it difficult to keep my nose out of anything that involves infinity. [

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First, I should say I find it very difficult to understand how our Universe can be infinite, as it apparently had a beginning. If it is infinite, and expanding, I suppose we would have to argue that ∞ x 2 = ∞, and so on. I feel sure this would fit in with Cantor's mathematical infinities, but, like you, I have problems with it when it comes to physical infinity.

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*expansion to me means occupying slightly more space than before*"

Presumably, expansion could also mean creating more space. Again, there would probably be no reason why this could not be done with mathematical infinities, but it is difficult to apply it to physical infinity.

I bet this doesn't help, but I gave up being helpful when I retired. [

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