Logic
- Barbershop paradox: The supposition that if one of two simultaneous assumptions leads to a contradiction, the other assumption is also disproved leads to paradoxical consequences.
- What the Tortoise Said to Achilles "Whatever Logic is good enough to tell me is worth writing down...," also known as Carroll's paradox, not to be confused with the physical paradox of the same name.
- Crocodile dilemma: If a crocodile steals a child and promises its return if the father can correctly guess what the crocodile will do, how should the crocodile respond in the case that the father correctly guesses that the child will not be returned?
- Catch-22 (logic): A situation in which someone is in need of something that can only be had by not being in need of it.
- Drinker paradox: In any pub there is a customer who, if they drink, everybody in the pub drinks.
- Paradox of entailment: Inconsistent premises always make an argument valid.
- Lottery paradox: There is one winning ticket in a large lottery. It is reasonable to believe of a particular lottery ticket that it is not the winning ticket, since the probability that it is the winner is so very small, but it is not reasonable to believe that no lottery ticket will win.
- Raven paradox (or Hempel's Ravens): Observing a green apple increases the likelihood of all ravens being black.
- Unexpected hanging paradox: The day of the hanging will be a surprise, so it cannot happen at all, so it will be a surprise. The surprise examination and Bottle Imp paradox use similar logic
Read more about this topic: List Of Paradoxes
Famous quotes containing the word logic:
“Somebody who should have been born
is gone.
Yes, woman, such logic will lead
to loss without death. Or say what you meant,
you coward . . . this baby that I bleed.”
—Anne Sexton (1928–1974)
“It is the logic of our times,
No subject for immortal verse—
That we who lived by honest dreams
Defend the bad against the worse.”
—Cecil Day Lewis (1904–1972)