Combining Texts

You have chosen 'works' by George Cantor, 'What Required for Foundation for Maths?' by John Mayberry and 'True in Theory, but not in Practice' by Immanuel Kant

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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