Combining Texts

You have chosen 'Logic (Encyclopedia I)' by Georg W.F.Hegel, 'Set Theory and the Continuum Hypothesis' by Paul J. Cohen and 'A Problem about Substitutional Quantification?' by Saul A. Kripke

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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