Notes on Vagueness

Notes on Vagueness. A 3-valued approach to vagueness is defended. In contrast to other 3-valued approaches the logic is an extension of classical logic, due to the use of both a Boolean negation and a predicate negation. The view is justified by semantic considerations. Crucial issues (Sorites reasoning, higher order vagueness, existence of cut off points, 'penumbral truth') are discussed from the perspective developed, and some contrasts (mostly to supervaluationism) outlined. An extended version appeared as book in 2026 (Berlin: Logos).