Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'The Logical Syntax of Language' by Rudolph Carnap and 'Forget the 'correspondence theory of truth'' by David Lewis

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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