Combining Texts

You have chosen 'works (all lost)' by Aristippus the elder, 'The iterative conception of Set' by George Boolos and 'Metaphysical Foundations of Natural Science' by Immanuel Kant

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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