Doubly-nonlinear problems

Abstract

In this section we touch upon some selected problems not mentioned so far. This concerns situations with the time-derivative $\frac{{\text{d}}} {{{\text{d}}t}}u$ appearing nonlinearly (Sections 11.1.1 and 11.1.2) or acting on a nonlinearity (Section 11.2), in the former case also in combination with the second time-derivative $\frac{{{\text{d}}^{\text{2}} }} {{{\text{d}}t^2 }}u$ involved linearly (Section 11.3).