 analysis |  a priori justification and knowledge |  behaviorism |  Carnap, Rudolf |  definitions |  epistemology |  Frege, Gottlob |  Frege, Gottlob: theorem and foundations for arithmetic |  Kant, Immanuel |  logical constants |  logical truth |  logicism and neologicism |  meaning, theories of |  metaphysics |  naturalism |  operationalism |  phenomenology |  Quine, Willard Van Orman |  rationalism vs. empiricism |  Russell, Bertrand 