Combining Texts

You have chosen 'The Meditations (To Himself)' by Marcus Aurelius, 'The Concept of Truth for Formalized Languages' by Alfred Tarski and 'Counterfactual Dependence and Time's Arrow' by David Lewis

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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