Combining Texts

You have chosen 'Letters to Burcher De Volder' by Gottfried Leibniz, 'Human Flourishing, Ethics and Liberty' by Gilbert Harman and 'Darwin's Dangerous Idea' by Daniel C. Dennett

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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