Combining Texts

You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'The Foundations of Mathematics (2nd ed)' by Kenneth Kunen and 'On Formally Undecidable Propositions' by Kurt Gdel

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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