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Originally Posted by Paranoid Android
How do you know time had a starting point?
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Because that's what the math that explains the data we have says.
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You don't need to prove it's infinite. The uncertainty itself is a given until proven. So until we can prove the universe is finite, it is infinite by default. And infinity is a concept. It's not a existing value that can actually exist. It's the default declaration to anything deemed impossible to calculate. Such as division by 0.
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Not .. really. Its not "infinite by default" - the answer would simply be unknown. For local analysis purposes, you can "assume infinity" but calculations may not hold over very large distances - just like assuming space is "flat" is fine until you get near large gravity wells or huge distances.
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No one has actually divided an object by zero. They didn't prove it's equivalent to infinity. It remains that way until someone can actually divide something by zero.
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Um, I'll refer you to the mathematics of Cantor, complex variables, and limit theory.