Combining Texts

You have chosen 'Science and Method' by Henri Poincaré, 'A Problem about Substitutional Quantification?' by Saul A. Kripke and 'Sources of Knowledge of Mathematics' by Gottlob Frege

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All the ideas for Thought, or select a subheading:
      A. Modes of Thought
      B. Mechanics of Thought
      C. Content
      D. Concepts
      E. Abstraction