Epsilon Calculi Epsilon Calculi are extended forms of the predicate calculus that incorporate epsilon terms. Epsilon terms are individual terms of the form ‘εxFx’, being defined for all predicates in the language. The epsilon term ‘εxFx’ denotes a chosen F, if there are any F’s, and has an arbitrary reference otherwise. Epsilon calculi were originally developed to study certain forms of arithmetic, and set theory;

Locke: Knowledge of the External World The problem of how we can know the existence and nature of the world external to our mind is one of the oldest and most difficult in philosophy. The discussion by John Locke (1632-1704) of knowledge of the external world have proved to be some of the most confusing and difficult passages of his entire body of philosophical work.

Haskell Brooks Curry (1900-1982) Haskell Brooks Curry was a mathematical logician who developed a distinct philosophy of mathematics. Most of his work was technical: he was the major developer of combinatory logic, which nowadays plays a role in theoretical computer science. This formalism was originally intended to be a basis for a system of symbolic logic in the usual sense, but the original system turned

Knowledge Philosophy’s history of reflection upon knowledge is a history of theses and theories; but no less of questions, concepts, distinctions, syntheses, and taxonomies. All of these will appear in this article. They generate, colour, and refine these philosophical theses and theories about knowledge. The results are epistemological — philosophical attempts to understand whatever is most fundamentally understandable about the nature and availability of knowledge.

Gottlob Frege (1848—1925) Gottlob Frege was a German logician, mathematician and philosopher who played a crucial role in the emergence of modern logic and analytic philosophy. Frege’s logical works were revolutionary, and are often taken to represent the fundamental break between contemporary approaches and the older, Aristotelian tradition. He invented modern quantificational logic, and created the first fully axiomatic system for logic, which was complete

Surrogate Parenting Surrogate parenting is an arrangement in which one or more persons, typically a married infertile couple (the intended rearing parents), contract with a woman to gestate a child for them and then to relinquish it to them after birth. Surrogate parenting is also sometimes referred to as “contract pregnancy,” in part, so as not to beg the question about who is the child’s