netzweltler
Posts:
311
From:
Germany
Registered:
8/6/10


Re: Cardinality of turning wheel
Posted:
Mar 5, 2013 2:45 PM


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 onetoone correspondence with the > set of integers, hence has cardinality aleph0. > > quasi
Is it true to say, that the wheel finishes countably infinitely many revolutions, whenever we assign an origin (the point between past and future)?

