Combining Texts

You have chosen 'The Beautiful in Music' by Eduard Hanslick, 'Three Dialogues of Hylas and Philonous' by George Berkeley and 'The Middle Works (15 vols, ed Boydston)' by John Dewey

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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