On 28 December 2013 17:15, Jason Resch <jasonre...@gmail.com> wrote:

> On Fri, Dec 27, 2013 at 11:06 PM, LizR <lizj...@gmail.com> wrote:
>
>> Clearly programmes don't have to be deterministic. They could contain a
>> source of genuine randomness, in principle.
>>
>
> That source, if it is within the program, would necessarily be
> deterministic.  If it is external to the program, then it is more properly
> treated as an input to the program rather than a part of the program itself.
>
> In practice, computers draw on sources of environmental noise such as
> delays between keystrokes, timing of the reception of network traffic, and
> delays in accessing data off of hard drives, etc. These steps are necessary
> precisely because programs cannot produce randomness on their own.
>
> I knew that - honest! :-)

I was answering the question as posed. I believe that in practice all
real-world programmes are deterministic, and (more to the point) the UD is.

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