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The Asymptotic Behaviour of Semigroups of Linear Operators (Hardcover, 1996 ed.)
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The Asymptotic Behaviour of Semigroups of Linear Operators (Hardcover, 1996 ed.)
Series: Operator Theory: Advances and Applications, 88
Expected to ship within 10 - 15 working days
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Over the past ten years, the asymptotic theory of one-parameter
semigroups of operators has witnessed an explosive development. A
number oflong-standing open problems have recently been solved and
the theory seems to have obtained a certain degree of maturity.
These notes, based on a course delivered at the University of
Tiibingen in the academic year 1994-1995, represent a first attempt
to organize the available material, most of which exists only in
the form of research papers. If A is a bounded linear operator on a
complex Banach space X, then it is an easy consequence of the
spectral mapping theorem exp(tO"(A)) = O"(exp(tA)), t E JR, and
Gelfand's formula for the spectral radius that the uniform growth
bound of the wt family {exp(tA)h~o, i. e. the infimum of all wE JR
such that II exp(tA)II :::: Me for some constant M and all t 2: 0,
is equal to the spectral bound s(A) = sup{Re A : A E O"(A)} of A.
This fact is known as Lyapunov's theorem. Its importance resides in
the fact that the solutions of the initial value problem du(t) =A
() dt u t , u(O) = x, are given by u(t) = exp(tA)x. Thus,
Lyapunov's theorem implies that the expo- nential growth of the
solutions of the initial value problem associated to a bounded
operator A is determined by the location of the spectrum of A.
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