Combining Texts

You have chosen 'Nominalism and Substitutional Quantifiers' by Ruth Barcan Marcus, 'Concerning the Trinity' by Boethius and 'On the Foundations of Logic and Arithmetic' by David Hilbert

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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