Combining Texts

You have chosen 'Mathematics without Numbers' by Geoffrey Hellman, 'Parthood and Identity across Time' by Judith (Jarvis) Thomson and 'Theory Change and the Indeterminacy of Reference' by Hartry Field

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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