Combining Texts

You have chosen 'Justified Belief as Responsible Belief' by Richard Foley, 'The Architecture of Mathematics' by Nicholas Bourbaki and 'The Aim and Structure of Physical Theory' by Pierre Duhem

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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