Henkin Sentence
A Henkin sentence is a self-referential statement that asserts its own provability…
Grelling Paradox
The Grelling paradox explores self-reference in language. It questions whether the word…
Gödel Sentence
A self-referential sentence in formal systems, a Gödel sentence demonstrates incompleteness theorems…
Gödel Numbering
Gödel numbering assigns unique natural numbers to symbols, formulas, and proofs in…
Eubulides’ Paradoxes
Eubulides of Miletus proposed several paradoxes, most famously the Liar Paradox. These…
Epimenides Paradox
The Epimenides paradox, also known as the liar paradox, arises from Epimenides'…
Diagonalization Lemma
A crucial lemma in Gödel's incompleteness theorems. It states that for any…
Curry’s Paradox
Curry's paradox is a logical paradox that emerges from self-referential statements asserting…