netzweltler
Posts:
278
From:
Germany
Registered:
8/6/10
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Re: Cardinality of turning wheel
Posted:
Mar 2, 2013 6:14 PM
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On 2 Mrz., 20:39, quasi <qu...@null.set> wrote:
> netzweltler wrote:
> >What is the cardinality of the number of revolutions of a
> >turning wheel, if there is no beginning and no end to it?
>
> For a wheel revolving forever (both past and future), the
> set of revolutions is in one-to-one correspondence with the
> set of integers, hence has cardinality aleph-0.
>
> quasi
Is this still true, if the wheel is revolving at infinite speed,
meaning, that we can see at least one revolution no matter how small
the time we are watching it?
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