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**Physics, Astronomy & Cosmology / Re: Is it possible to define infinity?**

« **on:**14/11/2017 22:20:11 »

A stick can indeed be infinite. Having one end is not a problem: however long your stick may be, I can conceive of a longer one, without limit. We often use the term "semi-infinite" in physics and applied maths to denote a quantity or space with an origin and no positive limit. It's just one of several useful infinities, and AFAIK there is provably an infinity of infinities for which we have no conceivable use.

There is no contradiction in a countable or "denumerable" infinity. All it means is that you can in principle assign an ordinal number to every member of the set, but that doesn't mean you can predict the nth member

There is no contradiction in a countable or "denumerable" infinity. All it means is that you can in principle assign an ordinal number to every member of the set, but that doesn't mean you can predict the nth member

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