Cette oeuvre fournit des le ons in dites sur les fonctions de variables r elles et les d veloppements en s ries de polyn mes. Ces le ons ont t profess es par les plus grands math maticiens de l' cole normale sup rieure. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly...