Combining Texts

You have chosen 'Remarks on the definition and nature of mathematics' by Haskell B. Curry, 'Letters to Hugo Boxel' by Baruch de Spinoza 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