LÉVY, Problèmes Concrets d'Analyse Fonctionnelle, 1951

Second edition.
Paul Lévy (1886-1971), professor at the École Polytechnique, was a major French mathematician, founder of modern functional analysis and a pioneer in probability theory. His work Problèmes Concrets d'Analyse Fonctionnelle (Concrete Problems in Functional Analysis) is an augmented re-edition of his Leçons d'Analyse Fonctionnelle.