Combining Texts

You have chosen 'Philosophical Essay on Probability' by Pierre Simon de Laplace, 'Letters to Pierre Bayle' by Gottfried Leibniz and 'Set Theory and related topics (2nd ed)' by Seymour Lipschutz

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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