Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Theory of Knowledge (2nd ed 1977)' by Roderick Chisholm and 'Nominalism and Substitutional Quantifiers' by Ruth Barcan Marcus

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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