Combining Texts

You have chosen 'Changes in Events and Changes in Things' by Arthur N. Prior, 'Introduction to Zermelo's 1930 paper' by Michael Hallett and 'works' by Stanislaw Lesniewski

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