Paradoxes and sophisms

Paradoxes:

  • "Liar" (Paradox of Eubulides or Epimenides).

This famous paradox was written by the great stoic and logician Chrysippus. In a vain attempt to resolve this paradox, the critic, grammarist and poet Philetus of Kos died of insomnia.

The Cretan sailed to Greece and declared to several Greeks on the shore: "All Cretans are liars!" Did he tell the truth or lie?

A week later the Cretan sailed to Greece again and announced: "All Cretans are liars, and everything I say is true." Although those on the beach did not know what he had said a week ago, they were greatly confused.

If someone says “I always tell a lie, ” is he telling the truth in this case? Or is he lying?

  • "Double Liar" (Jordan's Paradox).

The author of the paradox is the English mathematician Jordan. The paradox was invented in 1913.

Inscriptions on the sides of the card:

Both on the back and on the front side it is written:

"The statement on the other side of this card is correct."

  • The Barber's Paradox (Russell's Paradox).

The paradox was formulated by the English logician, philosopher and mathematician Bertrand Russell.

There is one barber in the village. He shaves everyone who does not shave himself, but no one else.

Who Shaves the Barber?

  • The lazy paradox.

If fate has a plan according to which everything should happen, then is there any point in, for example, visiting a doctor? If I get sick and I am destined to recover, then this will happen regardless of whether I go to the doctor or not. If my destiny is not to get well, the doctor will still not be able to help me.

Sophisms:

  • Crocodile

A crocodile living in the Nile stole a child. The child's mother begged the crocodile to give him back. And the crocodile not only could speak, but was also a great sophist and declared: “If you guess what I will do with him, I will return him to you. But if you do not predict his fate, I will eat him. " What should a mother say to save a child?

  • Is it possible to give what you don't have?

Sophist: “The curmudgeon gives his gold with grief. But when he has gold, he does not have sorrow, therefore he gives what he does not have. "

  • Eternal bliss or a piece of bread. What's better?

Is there anything better than eternal bliss? Nothing. A piece of bread is better than nothing. Hence, bread is better than eternal bliss.

Quotes from life:

  • No one goes to that restaurant because it is too crowded.
  • If you receive this message, please call me, and if you did not receive it, do not call me.
  • The person who wrote such a stupid sentence cannot write at all.
  • Stay away from the water until you can swim.

This is something to think about:

  • Imagine a bullet capable of going through any obstacle. Now imagine an absolutely bulletproof vest that nothing can penetrate. What happens if such a bullet hits such a vest?
  • Can a person drown in the fountain of eternal life?
  • Mission - Disagree with a mission. Do you agree?
  • The girl goes back in time. There she kills her grandmother. Since the grandmother was killed, the girl could not be born. And if she could not be born, then, accordingly, she did not kill her grandmother.
  • If the temperature in the morning is 0 degrees, and the weather forecast promises that tomorrow it will be 2 times colder, what will the temperature be?
  • Answer honestly (yes or no) to the following question: Is your next word no?
  • What happens if you drive at the speed of light and turn on your headlights?