French Mathematicians on Stamps

My René Descartes stamps, including the one after the painting in the Louvre by Frans Hals

Click for a first day cover of Cauchy [jpg, size 972x546, 120 kB]               Gaspard Monge

and a dutch visitor from the previous century

email [remove the antispam phrase first]: a.a.jagers@misc-no-spam.utwente.nl

d'Alembert Pascal Descartes Lagrange (half Italian)