Infinitesimal calculus

"His "Calcul Infinitesimal" ... published in 1968 addresses the needs of a good undergraduate - and his instructor - in Calculus. This book is well- written, well-arranged and classroom-tested. It compares to the best classics like Whittaker and Watson" - Pierre Cartier. Note that the French version of Calculus for the undergraduate was more like today's (Complex and Real) Analysis for the American undergraduate.