Combining Texts

You have chosen 'Intro to 'Philosophical Essays'' by Richard Cartwright, 'A General Principle to Explain Laws of Nature' by Gottfried Leibniz and 'A World of Propensities' by Karl Popper

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All the ideas for Mathematics, or select a subheading:
      A. Nature of Mathematics
      B. Foundations for Mathematics
      C. Sources of Mathematics