Combining Texts

You have chosen 'New System and Explanation of New System' by Gottfried Leibniz, 'The Structure of Appearance' by Nelson Goodman and 'Regressive Method for Premises in Mathematics' by Bertrand Russell

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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