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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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Periodic solutions for a differential equation in Banach space
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by James H. Lightbourne PDF
Trans. Amer. Math. Soc. 238 (1978), 285-299 Request permission

Abstract:

Suppose X is a Banach space, $\Omega \subset X$ is closed and convex, and $A:[0,\infty ) \times \Omega \to X$ is continuous. Then if \[ \lim \limits _{h \to 0} |x + hA(t,x);\Omega |/h = 0\quad {\text {for}}\;{\text {all}}\;(t,x) \in [0,\infty ) \times \Omega ,\] there exist approximate solutions to the initial value problem \begin{equation}\tag {$IVP$}u’(t) = A(t,u(t)),\quad u(0) = x \in \Omega .\end{equation} In the case that $A(t,x) = B(t,x) + C(t,x)$, where B satisfies a dissipative condition and C is compact, we obtain a growth estimate on the measure of noncompactness of trajectories for a class of approximate solutions. This estimate is employed to obtain existence of periodic solutions to (IVP).
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Additional Information
  • © Copyright 1978 American Mathematical Society
  • Journal: Trans. Amer. Math. Soc. 238 (1978), 285-299
  • MSC: Primary 34G05
  • DOI: https://doi.org/10.1090/S0002-9947-1978-0481337-X
  • MathSciNet review: 0481337