Combining Texts

You have chosen 'A priori/A posteriori' by Albert Casullo, 'Fact, Fiction and Forecast (4th ed)' by Nelson Goodman and 'On the Concept of Number' by David Hilbert

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All the ideas for Science, or select a subheading:
      A. Basis of Science
      B. Scientific Theories
      C. Induction
      D. Explanation