2 problems

Let $E(t)$ denote the energy, let $\gamma$ be the time-dependent damping coefficient, and let $m>5$. Suppose that there exists a function $kappa(t)$ satisfying suitable conditions.…

Conjecture on nonlinear damping. The results of the paper can also be extended to this initial boundary value problem with the nonlinear damping terms $\mu_1|u_t|^{m-2}u_t$ and…