Data types | Type theory

Bottom type

In type theory, a theory within mathematical logic, the bottom type of a type system is the type that is a subtype of all other types. Where such a type exists, it is often represented with the up tack (⊥) symbol. When the bottom type is empty, a function whose return type is bottom cannot return any value, not even the lone value of a unit type. In such a language, the bottom type may therefore be known as the zero or never type. In the Curry–Howard correspondence, an empty type corresponds to falsity. (Wikipedia).

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Related pages

Up tack | Parametric polymorphism | Type safety | Scala (programming language) | Top type | Type inference | Unit type | Subtyping | Contradiction | Julia (programming language) | Curry–Howard correspondence | Empty type | Covariance and contravariance (computer science) | Ceylon (programming language) | Dart (programming language) | NaN | Null pointer | Type theory | Mathematical logic | TypeScript