Figure 3From: Internal feedback stabilization of multi-dimensional wave equations with a boundary delay: a numerical studyThe energy \(E_{0}(t)\) of the wave system without delay (3.13)–(3.16) when: a) \(a(x)=1\), and \(k=-1\); b) \(a(x)=1\), and for negative values of k; c) \(a(x)=1\), and \(k=0.1\)Back to article page