 abstract objects |  Bolzano, Bernard |  Brentano, Franz |  cognitive science |  consciousness |  dependence, ontological |  Heidegger, Martin |  Ingarden, Roman |  intentionality |  Lotze, Hermann |  other minds |  perception: the problem of |  phenomenology |  propositions |  reference |  Sartre, Jean-Paul |  Schutz, Alfred |  self-consciousness: phenomenological approaches to |  Stumpf, Carl 