Bruno, we had similar puzzles in middle school in the 30s.
The barber could not shave himself because he shaved only those who did not
shave themselves (and shaved all). So for (Q #1) in the 1st vriant
*she(?)* was a female, unless *he(?)* was a beardless male
(and the 'all' refers to only the *bearded* males requiring a shave).
Q#2 is beyond me, I do not resort to a QM-pattern like Schrodinger's cat.
(Sh/H)e is either-or, not both.
On Fri, Oct 9, 2009 at 12:00 PM, Bruno Marchal <marc...@ulb.ac.be> wrote:
> I am so buzy that I have not the time to give long explanations, so I
> give here a short exercise and a subject of reflexion instead.
> There is Tyrannic country where by law it was forbidden for any man to
> have a beard.
> And there is village, in that country, and it is said that there is a
> barber in that village, who shaves all and only the men who don't
> shave themselves.
> Two questions:
> 1) What is the gender of the barber?
> 2) What the hell has all this to do with diagonalization, ... and
> universal machine?
> Have a good day,
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