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Subdifferentials - Theory and Applications (Paperback, Softcover reprint of the original 1st ed. 1995)
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Subdifferentials - Theory and Applications (Paperback, Softcover reprint of the original 1st ed. 1995)
Series: Mathematics and Its Applications, 323
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The subject of the present book is sub differential calculus. The
main source of this branch of functional analysis is the theory of
extremal problems. For a start, we explicate the origin and
statement of the principal problems of sub differential calculus.
To this end, consider an abstract minimization problem formulated
as follows: x E X, f(x) --+ inf. Here X is a vector space and f : X
--+ iR is a numeric function taking possibly infinite values. In
these circumstances, we are usually interested in the quantity inf
f( x), the value of the problem, and in a solution or an optimum
plan of the problem (i. e. , such an x that f(x) = inf f(X", if the
latter exists. It is a rare occurrence to solve an arbitrary
problem explicitly, i. e. to exhibit the value of the problem and
one of its solutions. In this respect it becomes necessary to
simplify the initial problem by reducing it to somewhat more
manageable modifications formulated with the details of the
structure of the objective function taken in due account. The
conventional hypothesis presumed in attempts at theoretically
approaching the reduction sought is as follows. Introducing an
auxiliary function 1, one considers the next problem: x EX, f(x)
-l(x) --+ inf. Furthermore, the new problem is assumed to be as
complicated as the initial prob lem provided that 1 is a linear
functional over X, i. e.
General
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