This is the category of Mathematical paradoxes.
“The drinker paradox is a theorem of classical predicate logic that can be stated: there is...Drinker paradox
“"What the Tortoise Said to Achilles" is a brief dialogue by Lewis Carroll which playfully...What the tortoise said to achilles
“Henry E. Kyburg, Jr.'s Lottery Paradox (1961, p. 197) arises from considering a fair 1000 ticket...Lottery paradox
“Sets are at the foundation of modern mathematics. However, many problems arise with the...Set Theory
“This isn't precisely a paradox. But the result comes from deriving a contradiction. This is an...The Diagonalization Proof