Combining Texts

You have chosen 'Mathematical Thought from Ancient to Modern Times' by Morris Kline, 'An Argument for the Identity Theory' by David Lewis and 'Psychophysical and theoretical identifications' by David Lewis

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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