This is the category of Mathematical paradoxes.
“ (a - b)(a + b) = b(a - b) However, this results in dividing by , because EDIT: Your mistake...The Equation 1 = 2
“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
“Infinity is the creator of great paradoxes. Infinity is a concept of convenience. It indicates...Infinity
“ The drinker paradox is a theorem of classical predicate logic that can be stated: there is...Drinker paradox
“ Henry E. Kyburg, Jr.'s Lottery Paradox (1961, p. 197) arises from considering a fair 1000...Lottery paradox