You have chosen 'Exigency to Exist in Essences' by Gottfried Leibniz, 'The Gay (Joyful) Science' by Friedrich Nietzsche and 'Les quaestiones de anima (lectures on the soul)' by Blasius of Parma
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| A. | Nature of Mathematics | |
| B. | Foundations for Mathematics | |
| C. | Sources of Mathematics |