Combining Texts

You have chosen 'De Ente et Essentia (Being and Essence)' by Thomas Aquinas, 'Two letters on mind' by Ren Descartes and 'Croce and Collingwood' by Gary Kemp

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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