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The surface of the torus is spatially flat, like the piece of paper, but finite. However, with expansion, it is possible that even if the universe just has a very large volume now, it will reach infinite volume in the infinite future.
You have to define what you mean by infinite. Infinite mass? Infinite volume? And also how you would measure these things. Infinite radius, for instance. If we accept relativity, you can never reach the end of the universe, even if the current radius is finite. So, is it meaningfully finite?
Even if this were true, we have no way of directly observing or confirming this as fact.
Nothing is infinite.. it's just a mathematical concept to explain things too large for us to conceive
Any object can be divided infinitely and yet the parts of it always exist in one form or another.
First law of thermodynamics states "energy can be transformed from one form to another, but cannot be created or destroyed".
In a way you could argue that the universe is infinite because its rate of expansion is faster than the rate at which one can travel within it. Thus you can travel infinitely far in any direction without reaching the edge.
it'll remain that way until we explore it all. Plain and simple! No one can prove it otherwise because there are no boundaries!
Nothing is infinite.. it's just a mathematical concept to explain things too large for us to conceive
Edit: relevant since the question makes no sense and is hence a false statement
You can't say something and call it fact without providing strong evidence to bolster that very statement.