Combining Texts

You have chosen 'On the Principles of Indiscernibles' by Gottfried Leibniz, 'Probability and Logic of Rational Belief' by Henry E. Kyburg Jr and 'Briefings on Existence' by Alain Badiou

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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