Once one ancient Greek said: "All ancient Greeks are liers". Was he a 100% right, a 100% wrong or else?

Answer 1

Eubulides, a logician from Megara, was said to have been the first to express the "Liar's Paradox", but not in the form you describe. You seem to be referring to Paul's letter to Timothy, which says of Cretans (not cretins!) that "They are all Liars" according to "One of their own".

The liar's paradox, in which a person who always lies says "I'm Lying", is a real paradox, but the version you refer to is easily solved.

The statement your ancient Greek makes is contingent; it may be true or false. We can't infer from what he says whether it is true or false, so we can't say he is right or wrong.

But we can infer that he is a liar For:

(1) If what he says is true, then he is a liar.
(2) If what he says is false, then he is a liar.
ergo, he is a liar.

Note: There is no inner paradox in (1) because liars don't have to tell lies all the time (in fact, they generally don't).

Answer 2

Every person on this earth has told a lie thus making them liars. Knowing that he would be 100% right. Everyone lies whether they be ancient Greeks or Americans of now.

Answer 3

100% right; if we supose that he is right, when he states "all ancient greeks are liers" he is saying that he is lying so the statement is false, in otherwords it becomes "all ancient greeks are NOT liers" so it is coherent

If we supose he is wrong; then the statement "all ancient greeks are liers" is true so he would be lying about this statement and we would get a contradiction cause he would need to be saying the truth ((and he is lying)); ergo he is right

Answer 4

If all ancient greeks are liars, he would be a liar too. thus 100% right.

Answer 5

If this guy is a Greek and he said all Greeks are liars, then he is lying because he is included if his statement is true, meaning that some are liars and some aren't liars.