Combining Texts

You have chosen 'works (fragments)' by Critolaus, 'Mathematical Thought from Ancient to Modern Times' by Morris Kline and 'Elucidation of some points in E.Schrder' by Gottlob Frege

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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