Mathematical Analysis and Numerical Methods for Science and Technology: Volume 5 Evolution Problems I - Softcover

Dautray, Robert

Softcover

ISBN 10: 3540661018 ISBN 13: 9783540661016

Publisher: Springer, 2013

Synopsis

299 G(t), and to obtain the corresponding properties of its Laplace transform (called the resolvent of - A) R(p) = (A + pl)-l , whose existence is linked with the spectrum of A. The functional space framework used will be, for simplicity, a Banach space(3). To summarise, we wish to extend definition (2) for bounded operators A, i.e. G(t) = exp( - tA) , to unbounded operators A over X, where X is now a Banach space. Plan of the Chapter We shall see in this chapter that this enterprise is possible, that it gives us in addition to what is demanded above, some supplementary information in a number of areas: - a new 'explicit' expression of the solution; - the regularity of the solution taking into account some conditions on the given data (u , u1,f etc ... ) with the notion of a strong solution; o - asymptotic properties of the solutions. In order to treat these problems we go through the following stages: in § 1, we shall study the principal properties of operators of semigroups {G(t)} acting in the space X, particularly the existence of an upper exponential bound (in t) of the norm of G(t). In §2, we shall study the functions u E X for which t --+ G(t)u is differentiable.

Edition details

• Publisher: Springer
• Publication date: 2013
• Language: English
• ISBN 10: 3540661018
• ISBN 13: 9783540661016
• Binding: Paperback
• Edition number: 1
• Number of pages: 756