Combining Texts

You have chosen 'Later Letters to Dedekind' by George Cantor, 'The Gay Science' by Friedrich Nietzsche and 'Grundgesetze der Arithmetik 1 (Basic Laws)' 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