Combining Texts

You have chosen 'works (all lost)' by Aristippus the elder, 'Grundlagen (Foundations of Theory of Manifolds)' by George Cantor and 'The Passions of the Soul' by Ren Descartes

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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