Combining Texts

You have chosen 'Frege's Theory of Numbers' by Charles Parsons, ''Ostrich Nominalism' or 'Mirage Realism'?' by Michael Devitt and 'A Completeness Theorem in Modal Logic' by Saul A. Kripke

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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