 Bolzano, Bernard |  Bradley, Francis Herbert: Regress |  categories |  causation: the metaphysics of |  dependence, ontological |  events |  Husserl, Edmund |  Ingarden, Roman |  mental causation |  moral non-naturalism |  nominalism: in metaphysics |  object |  properties |  quantum theory: quantum field theory |  relations |  states of affairs |  Williams, Donald Cary 