It is often suggested that truth-preservation is insufficient for logical consequence, and that consequence needs to satisfy a further condition of relevance. Premises and conclusion in a valid ...

This paper denies in principle that formal theory can be achieved. The actual pattern of research activity, termed "casual abstraction" method, is very different from the hypothetico-deductive method, ...

Why logic slumbered in the linguistic bliss devised by Aristotle's genius, and how it was awakened to a nobler destiny, is a story of great importance and interest for the student of mental sciences.