Post: Hardest Riddle?
07-25-2009, 11:31 PM #1
AgentJon
Former Staff
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Why is this a paradox? Can you solve it?
There is a village where the barber shaves all those and only those who do not shave themselves. Who shaves the barber?


Answer& link

    https://answers.yahoo.com/question/index;_ylc=X3oDMTB2Y2t1c212BF9TAzIxMTUzMDA5ODgEc2VjA2ZwBHNsawN0b2RheXE-?qid=20090625164520AAgNZ4A



OK. take a deep breath and read this slowly, because it is very tricky. First two definitions:

def 1) All and only those who shave themselves = S

def 2) All people in the village, including the barber, are either members of S or members of not-S. there is no one in the village that is a member of both.

If the barber shaved himself then he would be a member of S.
If the barber does not shave himself then he would be a member of not-S.

A barber who must shave all and only not-S can not shave any S

The barber can not shave himself, because he would be shaving a member of S

if the barber is not a self shaver then he is a member of not-S

The barber must shave himself because he must shave all members of not-S

Thus he must both shave and not shave himself

This is the paradox.

No one else in the village can shave the barber because only the barber can shave members of not-S.

This is a variation of Russel's paradox, and there are several ways to solve, or attempts, to solve this depending on how it is interpreted. I'm not even going to attempt a solution here. Someone could, and probably has, written a doctoral thesis on the subject.
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07-25-2009, 11:40 PM #2
elfmotat
Rᵤᵥ - ½gᵤᵥR ∝ Tᵤᵥ
Ya, it's sort of like "This sentence is false."

If it's false, then the false is false making it true, but if it's true then its false, etc.
07-25-2009, 11:52 PM #3
Human
League Champion
Yeah pretty hard riddle, I would never have got that.

Here is an easy one;

What do you know that is coming, but never does.

Tommorow, because you know that it is going to happen but when it comes then you have to wait again etc..

Just one I know, I the only one I have guessed correctly.
07-26-2009, 02:55 AM #4
Genocide-
★GoML★
i dont know human but heres a brain teaser you will take for ever to get.


UR stuck inside a cube and all u have is a mirror and a table how do u get out
07-26-2009, 06:19 AM #5
Dopey
NGU :/
Originally posted by NGU
i dont know human but heres a brain teaser you will take for ever to get.


UR stuck inside a cube and all u have is a mirror and a table how do u get out


dude whatever means you would normally use to get out you use it. **** the mirror climb up the table and bust your way out! hahaha
07-26-2009, 06:25 AM #6
Dingus98
[move]fuk up m8[/move]
i get it :p but i had to read it like 3 times, lol
07-26-2009, 01:59 PM #7
ShAdoW_RiDa
Former Blue Mod
That's one hard riddle...

I have one..

But you must think about it..

You're stuck inside a metal box.. All you have is a lighter,table and saw...

How do you get out?!

I'll give 5k vbux to whoever solves it!
07-26-2009, 02:10 PM #8
Antones
Blood of Innocence
Lol i found that confusing to read
07-26-2009, 03:41 PM #9
Mighty Jebuz
Nerds √16 Ever!
Originally posted by another user
UR stuck inside a cube and all u have is a mirror and a table how do u get out

you look in the mirror you see what you saw, you take the saw and cut through the table, two halfs make a whole and you crawl through the whole. there you go escaped, bascially just a play on words with saw and whole

Originally posted by another user
You're stuck inside a metal box.. All you have is a lighter,table and saw...


basically the same except you saw the table in half, the two halves make a whole, you crawl through the whole and om not sure where the lighter comes into it, but im pretty sure thats so you can see what your doing.
07-26-2009, 04:15 PM #10
Originally posted by RiDa View Post
That's one hard riddle...

I have one..

But you must think about it..

You're stuck inside a metal box.. All you have is a lighter,table and saw...

How do you get out?!

I'll give 5k vbux to whoever solves it!


Saw the table into smaller pieces for firewood then use the lighter to set it alight then the heat will melt the metal :p

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