Combining Texts

You have chosen 'Truth and the Past' by Michael Dummett, 'On Copernicanism and Relativity of Motion' by Gottfried Leibniz and 'Letter to Frege 29.12.1899' by David Hilbert

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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