Combining Texts

You have chosen 'Two Problems of Epistemology' by Karl Popper, 'What is Mathematical Truth?' by Hilary Putnam and 'Boole calculus and the Concept script' 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