
The paper studies the Cauchy problem for a nonlinear degenerate parabolic equation. The equation with state \(u(x, t)\), \(x\in \mathbb R\), \(t> 0\) is described by \[ u_t= (u^\alpha)_{xx}+ a|u_x|^\lambda+ cv(x,t),\quad u(x,0)= f(x), \] where both \(u\) and \(f\) are nonnegative, and the parameters are such that \(ac\neq 0\), \(1<\alpha< 2\), and \(0<\lambda< 2/(3- \alpha)\). The stabilization problem is to find a suitable input \(v\) as a function of \(u\) (viewed as a kind of feedback control) such that \(\lim_{t\to\infty}u(x,t)= 0\) for all \(x\in \mathbb R\). A set of nonnegative functions \(f\) in \(C(\mathbb R)\), say \(G\), is introduced, such that \(f\) is bounded from above by \(\text{const}|x|^{\nu_0}\), \(\nu_0= (2-\lambda)/(\alpha- \lambda)\) when \(|x|\to\infty\), where the constant is determined by the above parameters and the induced pseudocharacteristic equation. The principal result is stated as follows: By setting \(v(x, t)= ru(x, t)^\beta\) with \(|r|\leq 1\), \(rc< 0\), and \(\beta= \lambda(2 -\alpha)/(2-\lambda)\), the stabilization is achieved as long as the initial state \(f\) belongs to the set \(G\).
Asymptotic stability in control theory, degenerate parabolic equations, Stabilization of systems by feedback, Initial value problems for second-order parabolic equations, Degenerate parabolic equations, one space dimension, relative stabilization, pseudocharacteristic equation
Asymptotic stability in control theory, degenerate parabolic equations, Stabilization of systems by feedback, Initial value problems for second-order parabolic equations, Degenerate parabolic equations, one space dimension, relative stabilization, pseudocharacteristic equation
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