constructive mathematics, realizability, computability
propositions as types, proofs as programs, computational trinitarianism
natural deduction metalanguage, practical foundations
type theory (dependent, intensional, observational type theory, homotopy type theory)
computational trinitarianism = propositions as types +programs as proofs +relation type theory/category theory
basic constructions:
strong axioms
A program. A construction of a term of some type. The topic of computability theory.
type I computability | type II computability | |
---|---|---|
typical domain | natural numbers $\mathbb{N}$ | Baire space of infinite sequences $\mathbb{B} = \mathbb{N}^{\mathbb{N}}$ |
computable functions | partial recursive function | computable function (analysis) |
type of computable mathematics | recursive mathematics | computable analysis, Type Two Theory of Effectivity |
type of realizability | number realizability | function realizability |
partial combinatory algebra | Kleene's first partial combinatory algebra | Kleene's second partial combinatory algebra |