Martin-L+Âf's Type Theory
Extensional Concepts in Intensional Type Theory, Implementing Mathematics Using NuPrl, Inductive Definitions in Type Theory, Martin-Löf Type Theory: Semantics and Proof Theory, Nuprl Project Related Web Sites, Research Profile of Anton Setzer
A Bibliography of Constructive Mathematics
Compiled by Erik Palmgren.
Confessions of a Formalist, Platonist Intuitionist
Autobiographical article by Fred Richman, describing his encounter with intuitionism.
Constructive Mathematics
Maintained by Fred Richards.
Intuitionism
A brief hypertext overview of the history of the subject.
Intuitionistic Logic
A short entry in the Stanford Encyclopaedia of Philosophy by Joan R. Moschovakis.
Intuitionistic Logic
A very brief overview of the subject by Alex Sakharov from MathWorld.
Intuitionistic Logic
A very concise introduction to the subject. Includes overview of the syntax, Kripke models, analytic tableau, natural deduction.
Intuitionistic logic
Free Online Encyclopedia article. What does Intuitionistic logic mean? What is Intuitionistic logic?
Intuitionistic logic
Wikipedia (free encyclopedia) article.
Porgi
Porgi is a Proof-Or-Refutation Generator for Intuitionistic propositional logic, implementated by Allen Stoughton. Given a sequent, Porgi either finds a minimally sized, normal natural deduction of the sequent, or it finds a "small", tree-based Kripke countermodel of the sequent. It is written in Standard ML.