Combining Texts

You have chosen 'A Puzzle about Belief' by Saul A. Kripke, 'Science and Hypothesis' by Henri Poincar and 'Remarks on the definition and nature of mathematics' by Haskell B. Curry

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All the ideas for Modality, or select a subheading:
      A. Necessity
      B. Possibility
      C. Sources of Modality
      D. Knowledge of Modality
      E. Possible worlds