Combining Texts

You have chosen 'The Bhagavad Gita' by Anon (Bhag), 'Remarks on the definition and nature of mathematics' by Haskell B. Curry and 'Mathematics and Indispensibility' by Elliott Sober

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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