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 kinds of higher-order nonlinear evolution partial differential equations (PDEs) have many commonalities via their unique quasilinear degenerate representations. The authors current a unified method of take care of those quasilinear PDEs.

The booklet first reviews the actual self-similar singularity ideas (patterns) of the equations. This strategy permits 4 varied periods of nonlinear PDEs to be handled at the same time to set up their remarkable universal gains. The booklet describes many houses of the equations and examines conventional questions of existence/nonexistence, uniqueness/nonuniqueness, worldwide asymptotics, regularizations, shock-wave idea, and numerous blow-up singularities.

Preparing readers for extra complex mathematical PDE research, the booklet 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 beneficial properties shared via different types of nonlinear PDEs and encourages readers to strengthen extra this unifying PDE method from different viewpoints.

**Read Online or Download Blow-up for Higher-Order Parabolic, Hyperbolic, Dispersion and Schroedinger Equations PDF**

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

**Sample text**

105) 32 Blow-up Singularities and Global Solutions And, therefore, (ii) requires precisely the same number of conditions, in order to delete an m-dimensional unstable manifold while approaching the righthand interface, as y → y0− , so we get a well-posed “m − m” shooting problem. (106) In case of a suﬃciently smooth dependence on parameters (say, analytic, which is diﬃcult to prove), we then conclude that the shooting problem (106) admits a countable set of solutions {fk , y0k }{k≥0} , (107) which we already observed above and will deal with later on.

108) The unstable manifold as y → y0− is (m = 2)-dimensional, which provides us with two necessary conditions. We will not use this ODE approach for the existence and multiplicity, since the L–S and ﬁbering methods turned out to be quite eﬃcient and rigorous, so we know that, at least, a countable discrete family of L–S patterns {Fk }{k≥0} really do exist. Moreover, all our numerical experiments showed that the overall set of patterns {Fσ }, where σ is a certain multi-index of an arbitrary length (recall that using this multi-index σ does not describe the actual variety of the patterns, so we use it in an informal way, just for convenience), was always a discrete one.

115) This gives, in the limit, a simpliﬁed ODE with the binomial linear operator, e−η (eη Φ)(6) ≡ Φ(6) + 6Φ(5) + 15Φ(4) + 20Φ + 15Φ + 6Φ + Φ = Φ n − n+1 (116) Φ. 8 shows the trace of the periodic behavior for equation (116) with n = 12 . 5. A more detailed study of the behavior of the oscillatory component as n → 0 is available in [118, § 12]. The passage to the limit n → +∞ leads to an equation with a discontinuous nonlinearity that is easily obtained from (103). 7 obtained for n = 15. We claim that the above two cases, m = 2 (even) and m = 3 (odd), exhaust all key types of periodic behaviors in ODEs like (9).

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

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