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Month: September 2018

So.. Does the barber shave himself?

Last week I asked a question about a barber?  Does he shave himself?  He shaves only the men who do no shave themselves, and nobody else.

Let’s look at the possible answers, which would appear to be ‘Yes’ or ‘No’

If the answer is ‘Yes’ then that means he does shave himself. But he only shaves men who don’t shave themselves. That breaks the rules

If the answer is ‘No’  then he is one of the men who doesn’t shave himself, so by the rules, he should shave…  himself!

A Paradox!

Since Russell proposed this paradox a few people have been less than impressed, writing it off as ‘wordplay’, but that seems to me like a rather killjoy approach to an interesting situation.

About the time I learnt about the barber – when I was about 15 – I read about another ‘logical story’…  the story then referred to a ‘Hangman’; but given my total opposition to capital punishment, let’s talk about a surprise test at school. That’s puzzle will be posted tomorrow.

The Problem with barbers

Ah..  I’ve been busy making videos for My Facebook Group and neglecting the blog!!

 

It looks like it was two months ago since I last write here!  Whoops……

I’m coming straight back at you with a problem in Logic!!   (And next week I’ll start something of a ‘series’   Don’t know what yet!

So here is a weekly Conundrum …  and I’ll declare my sources here. This is a ‘puzzle’ set by philosopher Bertrand Russell…  But its relates to ‘Set Theory’  which is part of some Maths courses.  Oh an apology, this puzzle assumes an all male world!

So we have a village..  and everyone in the village has a job,  and one of those jobs is the Barber..  Some of the people in the village shave themselves.  The Job of the Barber is to shave all the men – and only the men – who do not shave themselves

The question is…   Does the barber shave himself?