One-parameter Semigroups of Positive Operators
One-parameter Semigroups of Positive Operators
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DOI:
10.1007/bfb0074922
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发表时间:
1986-04
期刊:
影响因子:
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通讯作者:
W. Arendt;A. Grabosch;G. Greiner;Ulrich Moustakas;R. Nagel;U. Schlotterbeck;U. Groh;H. Lotz
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文献类型:
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作者:
W. Arendt;A. Grabosch;G. Greiner;Ulrich Moustakas;R. Nagel;U. Schlotterbeck;U. Groh;H. Lotz
As early as 1948 in the first edition of his fundamental treatise on Semigroups and Functional Analysis, E. Hille expressed the need for" developing an adequate theory of transformation semigroups operating in partially ordered spaces"(1. c,, Foreword). In the meantime the theory of one-parameter semigroups of positive linear operators has grown continuously. Motivated by problems in probability theory and partial differential equations W. Feller (1952) and RS Phillips (1962) laid the first cornerstones by characterizing the generators of special positive semigroups. In the 60's and 70's the theory of positive operators on ordered Banach spaces was built systematically and is well documented in the monographs of HH Schaefer (1974) and AC Zaanen (1983). But in this process the original ties with the applications and, in particular, with initial value problems were at times obscured. Only in recent years an adequate and up-to-date theory emerged, largely based on the techniques developed for positive operators and thus recombining the functional analytic theory with the investigation of Cauchy problems having positive solutions to each positive initial value. Even though this development-in particular with respect to applications to concrete evolution equations in transport theory, mathematical biology, and physics is far from being complete, the present volume is a first attempt to shape the multitude of available results into a coherent theory of one-parameter semigroups of positive linear operators on ordered Banach spaces.The book is organized as follows. We concentrate our attention on three subjects of semigroup theory: characterization, spectral theory and asymptotic behavior. By characterization, we understand the problem of describing special properties of a semigroup, such as positivity, through the generator. By spectral theory we mean the investigation of the spectrum of a generator. Asymptotic behavior refers to the orbits of the initial values under a given semigroup and phenomena such as stability.