Paradox on dlow's blog

Liar's paradox and truthfulness of statements

Sun, 13 Sep 2020 10:18:25 +0100

An essay on truthfulness of statements and what we can learn from them

Panza's paradox

Sat, 13 Apr 2019 18:58:12 +0100

Part 1

I have three prizes, and I promise that I will give you either A or B if you give me a true statement and give you C if you make me a false statement.

Q: What statement should you make if you want to get prize A

Part 2

Now I bring in prize D and make you a promise that I will give you either A or B if you give me a true statement and give you C or D if you give me a false statement.

Nelson Goodman's method

Wed, 28 Jun 2017 00:37:45 +0100

“I am not a liar.” - Everbody

Part 1

There are three brothers: John, James and William. One day you meet one of them on the street and you want to know which of the brothers he is. You are allowed to ask him one question answerable by yes or no.

John and James always lie. William always tells the truth. You wish to find out whether is he John.
Now John and James always tell the truth, and William always lie. You wish to find out whether he is John.

Part 2

There are now only two brothers. One of them is called Arthur. One of them always lie and the other always tells the truth. One day you meet the two brothers together. You are allowed to ask one of them one question answerable by yes or no.