From the Cogito of Descartes'--I think, therefore I am--arise the basic principles of recursive function theory, feedback control theory and quantum mechanics. 

Outline of a rational, idealist metaphysics in which the paradoxes of quantum mechanics arise naturally and inevitably, developed within the framework of modal logic.

The basic paradoxes of quantum mechanics are derived from traditional Leibnizian rationalist principles. 

A highly readable version of the classic by the Greek father of metaphysics. With a commentary.

A look at why Kant thought geometry & arithmetic were synthetic a priori, not analytic, concentrating on geometry. I agree with him, but only if predicate logic is also labelled synthetic.

A reconstruction of Kant's transcendental deduction of the categories (logical functions), expressed in terms compatible with related modern ideas like recursion theory and the anthropic principle. 

An introduction to the many-worlds idealism of F.H. Bradley. 

A proposal for a rationalist (nonmystical) mathematical Platonism, developed using the lambda-calculus. 

Wittgenstein's attempt to produce a consistent, logic-based materialist metaphysics, its failure and his attempt at a nonmetaphysical solution. 

Does quantum mechanics allow us to perform miracles and/or live forever? The answer may surprise you!