On Thu, Jan 29, 2015 at 2:19 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:

>>>  The "01" appearing above is supposed to be an initial segment of one
>> sequence,
>
>


>> >> OK, you gave me 2 elements, but what's the third element in this
>> uncountably infinitely long sequence of yours?
>
>
> > I have never pretended that I can enumerate them. I say only that I can
> generate all of them
>

 Then generate the third element.

> by dovetailing


It is not allowed to say in a algorithm "after you have completed these
infinite number of tasks then do this and such".


> > The easyness comes from the fact that I generate them all, by zigzagging
> on their initial fragment. Each initial segment is admittedly denoting its
> many different precisions.
>

So your algorithm will have to perform a infinite number of tasks before it
gets around to finding that third element. That's no good.

> We both agree that the set of binary infinite sequences is uncountable.
>

And you can't find a one to one correspondence between the set of subsets
of the Real Numbers and the Real numbers, there will always be a subset of
the Real numbers with no corresponding Real number.

John K Clark


>

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