Combining Texts

You have chosen 'Letters to Remond de Montmort' by Gottfried Leibniz, 'Consciousness, Philosophy and Mathematics' by Luitzen E.J. Brouwer and 'Reasons for Actions and Desires' by Philippa Foot

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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