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Liar Paradox (Eubulid or Epimenides Paradox)


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220 replies to this topic

#201 Kartten0

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Posted 10 December 2010 - 01:49 AM

What if we ignore all the smart-a** comments about human intentions, and focus on the last part(point) of the paradox. If someone says, "I always lie," are they telling the truth or not?
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#202 DaneBD

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Posted 02 March 2011 - 02:20 AM

The statements: "...always tell lies," or, "...I am lying," cannot be true, since that would be contradictory. They are not intended to be true, or to elucidate, but to confuse. The speaker is not intending to teach anything, or to inform, but to confuse; if you try to decide truth or fiction, you will be confused. That would be the lesson of this.
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#203 Valic4

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Posted 05 March 2011 - 10:54 PM

Spoiler for To break the Liar Paradox for all wariations

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#204 farenknight

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Posted 08 March 2011 - 12:26 PM

This is not a paradox.



So, person A: Everything I say is a lie.

This is a lie, and some of what he says is a lie. In truth, he would be saying this:

Person A (Revised): Some of what I say is a lie.

Apply this concept to what the Cretan said, and you receive the same results. The flaw in this is that it is assumed that a "lie" is the opposite of the truth. However, it is a lie if it is not the truth and a lie is not required to be the opposite of truth.

I was kind of shocked to see this when I could figure it out but I seemed to think that there was only one Creatian talking all the time! :blush:
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#205 draco_malfoy_274

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Posted 19 March 2011 - 08:07 AM

Even if he always lies or not, he will never say 'I always lie'.
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#206 Lidia Freitas

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Posted 06 April 2011 - 07:53 PM

I believe that this can be solved really easily.

If he says the truth, all Cretans are liars, and so he is a liar and he is not saying the truth. Okay, so this is not possible.
If he is telling a lie, all that we know is that not all Cretans are liars, we can't imply that all Cretans are truth-speakers.

A week later, he says that all Cretans are liars, which he have already discovered that isn't true, because he lied, and contradicts him. Because, in the previous week we proved that he was saying lies, so he is a liar, therefore in the second sentence he is lying too because he lies by saying that he is not a liar.

Edited by Lidia Freitas, 06 April 2011 - 07:54 PM.

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#207 missepicfail

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Posted 16 April 2011 - 11:08 PM

in the first instance, he could easily be telling the truth.
saying "all cretans are liars" only clearly states that all cretans lie. it doesn't mean that they only lie and are incapable of speaking truth.
in the second instance it's harder to believe that he speaks the truth.
he tells them that all cretans are liars but then contradicts himself by saying that all he speaks is truth. Which, i feel, is what caused the greeks confusion. how can one person claim that his race lies but then exclude himself from that generalization.

or you could look at it this way: he believes in both cases that what he speaks stands as a fact and so to him it is truth and he isn't lying. which goes back to the idea that he says "all cretans are liars" meaning that they lie but are also capable of speaking truth.
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#208 catmanzoo

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Posted 20 April 2011 - 10:24 PM

I think this cannot be resolved because there is never a declaration of the truth. If as an axiom you state that all Cretans are liars, then you can proceed with logical consequences but in this narrative, all you have is a Cretans declaring that Cretans are liars- so it can't be resolved logically.
In the second question someone states "I always lie" is still just a statement. Until you establish an axiom, you are wasting your time trying to figure it out.
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#209 AnnaLin9

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Posted 23 April 2011 - 06:23 PM

Key question is what is a lie? See it's based on what makes a liar. But a lie is only a lie based on the facts that surround it. So this means that at both times the same cretin was saying both the truth and a lie.


(example:If you say the universe is in chaos, the components are in chaos but the events aren't because it has to follow the laws of science.)
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#210 dutchgirl

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Posted 30 April 2011 - 04:33 PM

>>It's safe to say that everyone sometime in their life has told a lie. Which makes everyone a liar.<<

Case 1. The man is telling the truth. All Cretons are liars. A liar doesn't lie all the time, just when it suits him/her. Even if they only lie sometimes, they are still liars.

Case 2. The man is lying about always telling the truth. He cant always tell the truth, because all Cretons are liars. This is the perfect example for one of those times when a Creton lies. His lie being that he always tells the truth.
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