## Two remarks on hyperbolic dissipative problems.(English)Zbl 0579.35057

Nonlinear partial differential equations and their applications, Coll. de France Semin., Vol. VII, Paris 1983-84, Res. Notes Math. 122, 161-179 (1985).
[For the entire collection see Zbl 0559.00005.]
The author considers the semi-linear dissipative hyperbolic equation $u_{tt}-\Delta u+f(u)+g(u_ t)=h(t,x)\quad on\quad R_+\times \Omega \quad and\quad u=0\quad on\quad R_+\times \partial \Omega.$ He gives a simpler proof of the result of Americo-Prouse on boundedness of the energy of the solution u. In the second part one proves the uniform ultimate boundedness of the trajectories (improving a result of Babin- Vishik).
Reviewer: N.H.Pavel

### MSC:

 35L70 Second-order nonlinear hyperbolic equations 35B35 Stability in context of PDEs

Zbl 0559.00005