Combining Texts

You have chosen 'Taking Rights Seriously' by Ronald Dworkin, 'Nature and Observability of Causal Relations' by Curt Ducasse and 'On Divination ('De divinatione')' by M. Tullius Cicero

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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