Combining Texts

You have chosen 'An Axiomatization of Set Theory' by John von Neumann, 'A Dictionary of Philosophy' by A.R. Lacey and 'Logic and Epistemology of Causal Relations' by G.H. von Wright

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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