Research and Exposition in Mathematics -- Volume 1
R. T. Rockafellar
The Theory of Subgradients and its Applications to Problems of Optimization.
Convex and Nonconvex Functions
115 p., soft cover, ISBN 3-88538-201-6, EUR 10.00, 1981
The author provides in his typical clear and lucid style a detailed exposition of the
theory of subgradients. The text can meanwhile be considered classical in convex analysis.
"... opens a new stage in the development of the theory of nonconvex, nondifferentiable
(Zeitschr. für Angew. Math. und Mechanik)
"The book is highly recommended to anyone interested in modern analysis and optimization