 a priori justification and knowledge |  belief |  conditionals: counterfactual |  confirmation |  dispositions |  grounding, metaphysical |  impossible worlds |  indexicals |  information |  intentionality |  intrinsic vs. extrinsic properties |  logic: epistemic |  logic: justification |  logic: relevance |  names |  natural kinds |  possible worlds |  properties |  propositional attitude reports |  propositions |  propositions: structured |  reasons for action: justification, motivation, explanation |  semantics: two-dimensional |  truthmakers |  Wittgenstein, Ludwig 