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Paradoxes


Armat

I am an Italian.All Italians are liars.  

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Domino, MJ's assumption is "liar in strong sense". I also make that assumption ... which means liar always lies.

Yes, that's what I assume. Otherwise, there is nothing even to discuss here. If we should understand that being liar implies that one can lie sometimes and tell the truth some other times, then the statement is perfectly fine as it is and leads to no contradictions whatsoever. Someone says (Italian or not) all Italians may sometimes lie, and that's the end of the statement. No further analysis needed.

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In this Paradox, the claim as liar, means always lies, it is taken in its strong sense. But this does not change the fact, because you end up by a "lie of a lie" which would be the truth... so him always lying would lie about his lying, which means that he would say the truth even if he always lies... this is the main point of the paradox. Edited by Fadix
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In this Paradox, the claim as liar, means always lies, it is taken in its strong sense. But this does not change the fact, because you end up by a "lie of a lie" which would be the truth... so him always lying would lie about his lying, which means that he would say the truth even if he always lies... this the the main point of the paradox.

This is what I call random thought... :rolleyes:

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Oh MY GOD (referring to Domino mostly)!!!

 

A ) "This statement is false" is neither TRUE nor FALSE.

B ) "I am Italian AND all italians are liars" is FALSE.

 

Let's make a truth table and get this over with ok?

 

p = "this statement is false"

 

1) p = TRUE -> FALSE

2) p = FALSE -> TRUE

 

So NEITHER.

 

-------------

 

p = "I am italian"

q = "all italians are liars"

 

1) p= TRUE, q=TRUE -> FALSE (can't be since q implies not p)

2) p= TRUE, q=FALSE -> FALSE

3) p= FALSE, q=TRUE -> FALSE

4) p= FALSE, q=FALSE -> FALSE

 

All valid truth assignments result in FALSE.

 

 

Are we done? How can one possibly get more rigorous than an exhaustive enumeration? :blink:

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Oh MY GOD (referring to Domino mostly)!!!

 

A ) "This statement is false" is neither TRUE nor FALSE.

B ) "I am Italian AND all italians are liars" is FALSE.

 

Let's make a truth table and get this over with ok?

 

p = "this statement is false"

 

1) p = true -> FALSE

2) p = false -> TRUE

 

So NEITHER.

 

-------------

 

p = "I am italian"

q = "all italians are liars"

 

1) p= TRUE, q=TRUE -> can't be since q implies not p.

2) p= TRUE, q=FALSE -> FALSE

3) p= FALSE, q=TRUE -> FALSE

4) p= FALSE, q=FALSE -> FALSE

 

All valid truth assignments result in FALSE.

 

 

Are we done? How can one possibly get more rigorous than an exhaustive enumeration? :blink:

Sip, you are cheating here, CHEATER!!!

 

You are not quoting me, The first statment is true, it has no possibility of a false... so by considering this, and the lie of a lie would be true, you will end up with TRUE, TRUE -> TRUE.

 

Exactlly as the This statement is false.

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huh?

This statment = Italian

This statment is false = Italians are liars.

is false = are liars.

 

So, when you say statment, it implies Italians, while you do not question if this statment is a statment, you do question if the Italian is an Italian in your test. This is cheating.

Edited by Fadix
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Domino:

 

"I am an Italian AND all italians are liars"

 

Tell me how that can possibly be true. I am having a very hard time understanding what you are trying to say. Give me a scenario how that statement can be true. If it can't be true, then it has to be false.

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Here the original, just lets stick to this one: Epimenides the Cretan said, "All Cretans are liars."

 

All includes the Cretan.

Cretans being a liar, the Cretan that say it lies.

 

So what the Cretan is saying is I AM LYING!!!

 

This is like saying, that there is a sentence(a Cretan) that writes as(says) that all sentences are wrong, by writing this up, I am saying that this sentence is wrong... therefore... the "I" could be replaced by "sentence," "am" by "is" and "lying" by "false".

 

I = sentence

am = is

lying = false

 

Therefore, for a Cretan telling that all Cretans lies would be the same as stating that this sentence is false.

 

I don't see how more I can simplify this.

Edited by Fadix
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