Combining Texts

You have chosen 'An Argument for the Identity Theory' by David Lewis, 'There Are No Abstract Objects' by Cian Dorr and 'Foundations of Geometry' by David Hilbert

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All the ideas for Knowledge Sources, or select a subheading:
      A. A Priori Knowledge
      B. Perception
      C. Rationalism
      D. Empiricism
      E. Direct Knowledge