Combining Texts

You have chosen 'Immortality of the Soul' by Henry More, 'The Justification of Deduction' by Michael Dummett and 'Remarks on the Foundations of Mathematics' by Ludwig Wittgenstein

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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