Combining Texts

You have chosen 'Thinking About Mathematics' by Stewart Shapiro, 'On the Source of Necessity' by Ross P. Cameron and 'Scientific Explanation and the Causal Structure of the World' by Wesley Salmon

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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