Combining Texts

You have chosen 'What is Art?' by Leo Tolstoy, 'Intro to 'Provenance of Pure Reason'' by William W. Tait and 'Presidential Address of Am. Math. Soc' by Oswald Veblen

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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