PART I: MATHEMATICS AND PHILOSOPHY.- Paper 1: The Interrelations between Mathematics and Philosophy in Leibniz s Thought; Norma B. Goethe, Philip Beeley and David Rabouin.- Paper 2: Leibniz, Philosopher Mathematician and Mathematical Philosopher; Philip Beeley.- Paper 3: The Difficulty of Being Simple: On Some Interactions between Mathematics and Philosophy in Leibniz's Analysis of Notions; David Rabouin.- PART II: MATHEMATICAL REFLECTIONS.- Paper 4: Leibniz's Mathematical and Philosophical Analysis of Time; Emily R. Grosholz.- Paper5: Analyticité, Équipollence et Théorie des Courbes chez Leibniz; Eberhard Knobloch.- Paper 6: Leibniz as Reader and Second Inventor: The Cases of Barrow and Mengoli; Siegmund Probst.- PART III: THE PROBLEM OF INFINITY.- Paper 7: Leibniz s Actual Infinite in Relation to his Analysis of Matter; Richard Arthur.- Paper 8: Comparability of Infinities and Infinite Multitude in Galileo and Leibniz; Samuel Levey.- Paper 9: Leibniz on the Elimination of Infinitesimals; Douglas Jesseph.