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A single fee buys all essays on all subjects - £4.99.

Edited transcript of a lecture by Gregory Chaitin, author of `The Unknowable'.

The Arche project looks at the foundations of mathematics, especially at Frege's Theorem and its ramifications. Based at the University of St Andrews.

A closed, moderated, e-mail list for discussing Foundations of Mathematics moderated by Martin Davis. Archive available.

Reviews the foundations of mathematics with reference materials structured as content pages of a book. Includes links to expository materials.

The Goal of Hilbert II, which is in the tradition of Hilbert's program, is the creation of a system that enables a working mathematician to put theorems and proofs (in the formal language of predicate calculus) into it.

An attempt to reconstruct mathematical vernacular into a formal language which can be read by humans and also verified by software.

Online text of the book by Paul Taylor, together with supporting materials. The text aims to provide a conceptual and formal foundation for mathematics and computer science.

Build a single, distributed, computerized repository that rigorously represents all important, established mathematical knowledge