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Transactions of the American Mathematical Society

Published by the American Mathematical Society since 1900, Transactions of the American Mathematical Society is devoted to longer research articles in all areas of pure and applied mathematics.

ISSN 1088-6850 (online) ISSN 0002-9947 (print)

The 2020 MCQ for Transactions of the American Mathematical Society is 1.48.

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Operator semigroups for functional-differential equations with delay
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by W. M. Ruess and W. H. Summers PDF
Trans. Amer. Math. Soc. 341 (1994), 695-719 Request permission

Abstract:

We show that a strongly continuous operator semigroup can be associated with the functional differential delay equation (FDE) \[ \left \{ {\begin {array}{*{20}{c}} {x\prime (t) + ax(t) + Bx(t) \backepsilon F({x_t}),} \hfill & {t \geq 0} \hfill \\ {x{|_{{\mathbb {R}^ - }}} = \varphi \in E} \hfill & {} \hfill \\ \end {array} } \right .\] under local conditions which give wide latitude to those subsets of the state space $X$ and initial data space $E$, respectively, where (a) the (generally multivalued) operator $B \subseteq X \times X$ is defined and accretive, and (b) the historyresponsive function $F:D(F) \subseteq E \to X$ is defined and Lipschitz continuous. The associated semigroup is then used to investigate existence and uniqueness of solutions to (FDE). By allowing the domain of the solution semigroup to be restricted according to specific local properties of $B$ and $F$, moreover, our methods automatically lead to assertions on flow invariance. We illustrate our results through applications to the Goodwin oscillator and a single species population model.
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Additional Information
  • © Copyright 1994 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 341 (1994), 695-719
  • MSC: Primary 34K30; Secondary 47H20, 47N20
  • DOI: https://doi.org/10.1090/S0002-9947-1994-1214785-X
  • MathSciNet review: 1214785