 Aristotle, General Topics: metaphysics |  Aristotle, Special Topics: on non-contradiction |  contradiction |  Hegel, Georg Wilhelm Friedrich |  impossible worlds |  liar paradox |  logic: paraconsistent |  logic: substructural |  mathematics: inconsistent |  paradoxes: and contemporary logic |  Russell’s paradox |  self-reference |  Sylvan [Routley], Richard |  truth: correspondence theory of |  truth: deflationation about 