You have chosen 'The Journals of Kierkegaard' by Søren Kierkegaard, 'The Problem of Counterfactual Conditionals' by Nelson Goodman and 'Unity of Science as a Working Hypothesis' by H.Putnam/P.Oppenheim
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| A. | Nature of Mathematics | |
| B. | Foundations for Mathematics | |
| C. | Sources of Mathematics |