Combining Texts

You have chosen 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz, 'Letters to Johann Bernoulli' by Gottfried Leibniz and 'What is the Source of Knowledge of Modal Truths?' by E.J. Lowe

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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