By Victor A. Galaktionov

ISBN-10: 1482251728

ISBN-13: 9781482251722

ISBN-10: 1482251736

ISBN-13: 9781482251739

**Blow-up for Higher-Order Parabolic, Hyperbolic, Dispersion and Schrödinger Equations** indicates how 4 different types of higher-order nonlinear evolution partial differential equations (PDEs) have many commonalities via their targeted quasilinear degenerate representations. The authors current a unified method of take care of those quasilinear PDEs.

The ebook first reports the actual self-similar singularity ideas (patterns) of the equations. This strategy permits 4 diversified periods of nonlinear PDEs to be taken care of concurrently to set up their impressive universal beneficial properties. The publication describes many houses of the equations and examines conventional questions of existence/nonexistence, uniqueness/nonuniqueness, worldwide asymptotics, regularizations, shock-wave concept, and diverse blow-up singularities.

Preparing readers for extra complicated mathematical PDE research, the e-book demonstrates that quasilinear degenerate higher-order PDEs, even unique and awkward ones, will not be as daunting as they first look. It additionally illustrates the deep gains shared by means of various kinds of nonlinear PDEs and encourages readers to advance additional this unifying PDE procedure from different viewpoints.

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**Extra resources for Blow-up for Higher-Order Parabolic, Hyperbolic, Dispersion and Schroedinger Equations**

**Example text**

But ﬁrst, let us observe that the diﬀusion operator on the right-hand side in (1) is a monotone operator in H −m (Ω)-metric, so that the 1 Self-Similar Blow-up and Compacton Patterns 11 unique local solvability of the problem in suitable Sobolev spaces is covered by classic theory of monotone operators; see Lions’ book [276, Ch. 2]. We next show that, under certain conditions, some of these solutions are global in time but some cannot be globally extended and blow-up in ﬁnite time. For convenience, we use the natural substitution v = |u|n u v0 (x) = |u0 (x)|n u0 (x), =⇒ (30) which leads to the following parabolic equation with a standard linear elliptic operator on the right-hand side: (ψ(v))t = (−1)m+1 Δm v + v, n ψ(v) = |v|− n+1 v, with (31) where v satisﬁes the same Dirichlet boundary conditions (28), and even even “smoother” on ∂Ω, being a power > 1 of u there.

We will reveal an extremely oscillatory structure of such behavior to be compared with global oscillatory behavior obtained above by variational techniques. The phenomenon of oscillatory changing sign behavior of solutions of the Cauchy problem has been detected for various classes of evolution PDEs; see a general view in [174, Ch. 3–5] and various results for diﬀerent PDEs in [117, 118, 142]. For the present 2mth-order equations, the oscillatory behavior exhibits special features to be revealed.

For even m including (103), such equilibria for (102) do not exist, at least for n ∈ (0, 1]. We will show how this aﬀects the oscillatory properties of solutions for odd and even m’s. Periodic oscillatory components We now look for periodic solutions of (102), which are the simplest nontrivial bounded solutions that can be continued up to the interface at s = −∞. Periodic solutions, together with their stable manifolds, are simple connections with the interface, as a singular point of ODE (9). Note that (102) does not admit variational setting, so we cannot apply well-developed potential theory [303, Ch.

### Blow-up for Higher-Order Parabolic, Hyperbolic, Dispersion and Schroedinger Equations by Victor A. Galaktionov

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