 Brentano, Franz |  Brentano, Franz: theory of judgement |  Chisholm, Roderick |  consciousness: and intentionality |  Ehrenfels, Christian von |  existence |  facts |  fiction: fictional entities |  intentionality |  logic: free |  Mally, Ernst |  Marty, Anton |  nonexistent objects |  ontological arguments |  Platonism: in metaphysics |  possible objects |  properties |  psychologism |  reference |  Russell, Bertrand |  Stumpf, Carl |  tropes |  truth: correspondence theory of |  truth: identity theory of |  Twardowski, Kazimierz |  value theory 