Combining Texts

You have chosen 'The Spirit of the Laws (rev. 1757)' by Baron de Montesquieu, 'What is the Basis of Moral Obligation?' by H.A. Prichard and 'Popular Scientific Lectures' by Ernst Mach

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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