Combining Texts

You have chosen 'Questions on Aristotle's Physics' by John Buridan, 'Letters to Descartes' by Elizabeth, Princess of Bohemia and 'A Powers Theory of Modality' by Jonathan D. Jacobs

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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