You have chosen 'A Problem about Substitutional Quantification?st1=Saul A. Kripke' by , 'Letters to Foucher' by Gottfried Leibniz and 'Objections to 'Meditations' (Fifth)' by Pierre Gassendi
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| A. | Nature of Mathematics | |
| B. | Foundations for Mathematics | |
| C. | Sources of Mathematics |