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## Mathematics, Volume 1, Issue 2 (June 2013), Pages 46-75

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# Research

Open AccessArticle Stability of Solutions to Evolution Problems
Mathematics 2013, 1(2), 46-64; doi:10.3390/math1020046
Received: 26 February 2013 / Revised: 25 April 2013 / Accepted: 25 April 2013 / Published: 13 May 2013
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Abstract
Large time behavior of solutions to abstract differential equations is studied. The results give sufficient condition for the global existence of a solution to an abstract dynamical system (evolution problem), for this solution to be bounded, and for this solution to have a
Large time behavior of solutions to abstract differential equations is studied. The results give sufficient condition for the global existence of a solution to an abstract dynamical system (evolution problem), for this solution to be bounded, and for this solution to have a finite limit as $\text{t}\to \text{}\infty$ , in particular, sufficient conditions for this limit to be zero. The evolution problem is: $\stackrel{˙}{u}\text{}=\text{}A\left(t\right)u\text{}+\text{}F\left(t,\text{}u\right)\text{}+\text{}b\left(t\right),\text{}t\text{}\ge \text{}0;\text{}u\left(0\right)\text{}=\text{}{u}_{0}.$ (*) Here $\stackrel{˙}{u}\text{}:=\text{}\frac{du}{dt}\text{},\text{}u\text{}=\text{}u\left(t\right)\text{}\in \text{}H,\text{}H$ is a Hilbert space, $t\text{}\in \text{}{R}_{+}\text{}:=\text{}\left[0,\infty \right),\text{}A\left(t\right)$ is a linear dissipative operator: $\text{Re}\left(A\left(t\right)u,u\right)\text{}\le -\gamma \left(t\right)\left(u,\text{}u\right)$ where $F\left(t,\text{}u\right)$ is a nonlinear operator, $‖F\left(t,\text{}u\right)\text{}‖\text{}\le \text{}{c}_{0}{‖u‖}^{p},\text{}p\text{}>\text{}1,\text{}{c}_{0}$ and p are positive constants, $‖b\left(t\right)\text{}‖\text{}\le \text{}\beta \left(t\right)$, and $\beta \left(t\right)\ge 0$ is a continuous function. The basic technical tool in this work are nonlinear differential inequalities. The non-classical case $\gamma \left(t\right)\text{}\le \text{}0$ is also treated. Full article