 Abelard [Abailard], Peter |  Boethius, Anicius Manlius Severinus |  dialetheism |  Duns Scotus, John |  liar paradox |  logic: connexive |  logic: many-valued |  logic: of belief revision |  logic: relevance |  logic: substructural |  mathematics: inconsistent |  paradoxes: and contemporary logic |  self-reference |  Sorites paradox 