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drinking in the bar


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22 replies to this topic

#1 BMAD

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Posted 01 August 2013 - 12:37 PM

Two men walk by a bar. The man closest to the window says, "I am impressed, everyone is drinking in there". Shocked by his friend's abillity to be so observant, the friend asked how he knew. The first man simply said, I saw the first man. Since he was drinking, all people in there were drinking. "What?" Replied the friend.

Smiling the man said, "it is an axiom: if someone in the bar, is drinking, then everyone is drinking".

Disbelieving his friend, the friend marched back to the bar to have a look inside.

Did he confirm or deny the axiom?
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#2 DeGe

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Posted 01 August 2013 - 12:55 PM

Spoiler for A Toast

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#3 DeGe

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Posted 01 August 2013 - 01:03 PM

Spoiler for A funny example related to the theory for this question

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#4 BMAD

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Posted 01 August 2013 - 01:07 PM

Now what if the friend walks in the bar and he sees the first person drinking but the next person isn't drinking, does this contradict the axiom?
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#5 witzar

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Posted 01 August 2013 - 02:10 PM

Spoiler for A funny example related to the theory for this question

Spoiler for


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#6 DeGe

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Posted 01 August 2013 - 04:08 PM

 

Spoiler for A funny example related to the theory for this question

Spoiler for

Because the announcement that there will be a surprise test can be made on any random day, which is a surprise.


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#7 DeGe

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Posted 01 August 2013 - 04:43 PM

Now what if the friend walks in the bar and he sees the first person drinking but the next person isn't drinking, does this contradict the axiom?

 

No, it doesn't contradict the axiom. In truth, the actual probability that a person is drinking or not is 0<= p <= 1. However, as there is no physics that determines what the exact probability of everyone or any one person drinking would be, one must rely on inference and induction.


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#8 bonanova

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Posted 02 August 2013 - 10:48 PM

Spoiler for A funny example related to the theory for this question

 

This is one version of Martin Gardner's "Unexpected Hanging" paradox.

The resolution turns on the truthfulness of the person saying the test (hanging) will happen at a time that cannot be anticipated.


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#9 BMAD

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Posted 03 August 2013 - 03:41 AM

Yes, but this op actually refers to a different paradox.
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#10 gavinksong

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Posted 03 August 2013 - 08:23 AM

If this is a paradox, it should probably go in the paradox section.  :(

 

I'm kinda curious as to what this one is about, because I am pretty confused right now.  :huh:


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