Combining Texts

You have chosen 'Parmenides' by Plato, 'Rules for the Direction of the Mind' by Ren Descartes and 'Investigations in the Foundations of Set Theory I' by Ernst Zermelo

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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