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Pierre Varignon, a “professional” geometer at the dawn of the Enlightenment

INTERNATIONAL CONFERENCE

organised by
Sandra Bella & Jeanne Peiffer, for the tercentenary of his disappearance

January 17, 18, 19, 2023

For those who will not be able to come and who would like to follow it remotely, just send an email to S. Bella before Wednesday, January 18, 1 p.m., with subject "Varignon-January 19"

Partners :
Académie des sciences, ERC Philiumm, Laboratoire SPHère, Centre Alexandre Koyré,
Mazarine Library, Bibliothèque de l’Institut, with the financial supprt of the GDR Histoire des mathématiques

A geometer and mechanic recognized by his contemporaries, an influential member of the Royal Academy of Sciences, in epistolary contact with Leibniz, Newton and even the Bernoulli brothers, Pierre Varignon (1654-1722) shaped a scholarly trajectory that we would today call professional. He is a “normal” scientist, neither brilliant nor misunderstood, and it is in this that he deserves to be studied. His activities as an academician and teacher at the Mazarin College and the Royal College provide him with regular income, a framework for research and a publication platform. Thanks to his letter writing network, his reputation goes beyond the borders of the kingdom. His works located at a time of transition are marked by Cartesianism but also contribute to the birth of analytical mechanics. As a geometer, Varignon was able to recognize the innovative power of Leibnizian analysis, of which he became one of the first defenders in France.
The aim of this symposium is to make this polymath scholar better known, to take stock of the studies that have been devoted to him over the past few decades and to encourage research that sheds light on lesser-known facets of his commitment, such as his role in the dissemination of knowledge, particularly as a teacher, his positions in contemporary debates, or his technical inventions.

Registration open to the public
within the limit of available seats

PROGRAM
click on the picture to download

Tuesday January 17, 2023
Room Hugot, Académie des sciences, 3 rue Mazarine, 75006 Paris

09:30am	Welcome
10am	Opening Étienne GHYS, Permanent Secretary of the Academy of Sciences
10:30am	Introduction Sandra BELLA, CNRS, ERC Philiumm, SPHère, & Jeanne PEIFFER, CNRS, Centre Alexandre Koyré
Session 1 : Chair : Sandra Bella
11am	Pierre Varignon, épigone et disciple au collège Mazarin Patrick LATOUR, Mazarine Library, Paris
12am	Pierre Varignon, le professeur Pierre AGERON, Université de Caen

1pm Déjeuner

Session 2 Chair : Patrice Bret
3pm	Un ‘Esprit galant’ pour les courbes, reconstitution des échanges Varignon - Fontenelle sur la Géométrie de l’infini Sandra BELLA, CNRS, ERC Philiumm, SPHère
4pm	Le rire de Varignon Claudine POULOUIN, Université de Rouen
5pm	L’action de Pierre Varignon au sein de l’Académie royale des sciences Hughes CHABOT, Université Claude Bernard - Lyon I
6:30pm	Inauguration of the exhibition “Pierre Varignon (1654-1722) : practice and transmission of mathematics at the dawn of the Enlightenment” at the Mazarine Library

Wednesday January 18, 2023
Centre Alexandre Koyré, Campus Condorcet, Centre de colloques, Room 100, 1, place du Front populaire, 93322 Aubervilliers

Session 3 : Chair : Jeanne Peiffer, CNRS, Centre Alexandre Koyré
09:45	Mot de bienvenue Anne RASMUSSEN, directrice du Centre Alexandre Koyré, EHESS
10am	Recherches de Varignon sur l’optimisation des forces motrices utilisées en horlogerie et leurs applications à la mesure du temps Leslie VILLIAUME, Centre Alexandre Koyré, EHESS
11am	La naissance de la mécanique analytique dans le réseau épistolaire de Pierre Varignon (1690-1710) : nouvelles pistes de recherche Niccolò GUICCIARDINI, Università degli Studi di Milano
12am	Pierre Varignon dans l’œuvre de Jean Le Rond D’Alembert Christophe SCHMIT, CNRS, SYRTE, Observatoire de Paris

1pm Lunch

Session 4 : Chair : Irène Passeron
2:30pm	Entre deux maîtres : la correspondance de Varignon avec Leibniz et Johann Bernoulli Charlotte WAHL, Gottfried Wilhelm Leibniz Bibliothek, Hanovre
3:30pm	Pierre Varignon, pivot stratégique d’un réseau de correspondance international Jeanne PEIFFER, CNRS, Centre Alexandre Koyré

Thursday January 19, 2023

For those who will not be able to move and who would like to follow it remotely, just send an email to S. Bella before Wednesday, January 18, 1 p.m., with subject "Varignon-January 19"

Laboratoire SPHère, Room Valentin, 454A, Building Condorcet, Université Paris Cité,
4, rue Elsa Morante, 75013 Paris (Map)

Session 5 : Chair : Andrea Costa (CNRS, Centre Jean Pépin)
09:30am	The logarithmic curve - the Bernoullis, Varignon, Reyneau Antoni MALET, Institut d’Història de la Ciència, Universitat Autònoma de Barcelona
10:30am	The circulation of transmutation methods : Varignon between Roberval and Leibniz Siegmund PROBST, Gottfried Wilhelm Leibniz Bibliothek, Hanovre, & Staffan RODHE, Matematiska Institutionen Uppsala Universitet
11:30am	Leibniz entre Varignon et Grandi sur les plus qu’infinis David RABOUIN, CNRS, ERC Philiumm, SPHère

12:30am Lunch

Session 6 : Chair : Alain Bernard
2pm	L’étude de l’Analyse démontrée de Reyneau dans les écoles militaires espagnoles au XVIIIe siècle Mònica BLANCO, Universitat Politècnica Catalunya, Barcelona
3pm	Varignon, Malebranche, Reyneau et la diffusion du calcul leibnizien : des personnalités différentes au service d’un projet commun Claire SCHWARTZ, Université Paris Ouest Nanterre La Défense

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Sciences, Philosophie, Histoire – UMR 7219, laboratoire SPHERE

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