Mathematical Analysis and Numerical Methods for Science and Technology von Robert Dautray | Volume 5 Evolution Problems I | ISBN 9783642580901

Mathematical Analysis and Numerical Methods for Science and Technology

Volume 5 Evolution Problems I

von Robert Dautray und Jacques-Louis Lions, aus dem Französischen übersetzt von A. Craig
Mitwirkende
Autor / AutorinRobert Dautray
Übersetzt vonA. Craig
Beiträge vonM. Artola
Autor / AutorinJacques-Louis Lions
Beiträge vonM. Cessenat
Beiträge vonH. Lanchon
Buchcover Mathematical Analysis and Numerical Methods for Science and Technology | Robert Dautray | EAN 9783642580901 | ISBN 3-642-58090-4 | ISBN 978-3-642-58090-1

Mathematical Analysis and Numerical Methods for Science and Technology

Volume 5 Evolution Problems I

von Robert Dautray und Jacques-Louis Lions, aus dem Französischen übersetzt von A. Craig
Mitwirkende
Autor / AutorinRobert Dautray
Übersetzt vonA. Craig
Beiträge vonM. Artola
Autor / AutorinJacques-Louis Lions
Beiträge vonM. Cessenat
Beiträge vonH. Lanchon
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.