Combining Texts

You have chosen 'Necessary Existents' by Timothy Williamson, 'Of Organum or Ars Magna of Thinking' by Gottfried Leibniz and 'Mathematical Thought from Ancient to Modern Times' by Morris Kline

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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