Combining Texts

You have chosen 'works (all lost)' by Aristippus the elder, 'On Body and Force, Against the Cartesians' by Gottfried Leibniz and 'Introducing the Philosophy of Mathematics' by Michle Friend

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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