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Download Blow-Up in Quasilinear Parabolic Equations (De Gruyter by A. A. Samarskii, S. P. Kurdyumov, V. A. Galaktionov PDF

By A. A. Samarskii, S. P. Kurdyumov, V. A. Galaktionov

The target of the sequence is to provide new and significant advancements in natural and utilized arithmetic. good tested in the neighborhood over 20 years, it deals a wide library of arithmetic together with numerous vital classics.

The volumes provide thorough and designated expositions of the tools and concepts necessary to the themes in query. additionally, they communicate their relationships to different elements of arithmetic. The sequence is addressed to complex readers wishing to entirely research the topic.

Editorial Board

Lev Birbrair, Universidade Federal do Ceara, Fortaleza, Brasil
Victor P. Maslov, Russian Academy of Sciences, Moscow, Russia
Walter D. Neumann, Columbia college, long island, USA
Markus J. Pflaum, college of Colorado, Boulder, USA
Dierk Schleicher, Jacobs college, Bremen, Germany

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Additional info for Blow-Up in Quasilinear Parabolic Equations (De Gruyter Expositions in Mathematics)

Example text

Uli's - 1+II(m-I)" 2 1//11. ··ERN. (4) For our ends, it suffices to consider radially symmetric solutions, which depend on one variable, T/ = I~l All these satisfy a boundary value problem for an ordinary differential equation, l , n. () ::: 1I(t. : [( 'I'll p = [ ( l ' 11'- I)" where 'I'll > 0 and /I > I are constants, Substitution of (3) into (I) gives the following elliptic equation for lOs = p~' > 0: n Proof If 111 E ((N - 2)/(N + 2), 1), N ::: 3, or m E (0. ,) the solution of the equation (5).

Let us note that this approach (frequently using similarity methods) makes it possible to obtain more optimal, ami even new results. 39 We want to emphasize in particular the concept of asymptotic stability of selfsimilar solutions of nonlinear parabolic equations with respect to perturbations of the boundary data of the problem, as well as with respect to perturbations of the equation itself. Self-similar (invariant) solutions are not simply particular solutions appearing serendipitously. In many cases they serve as a sort of "centres of gravity" of a wide variety of solutions of the equation under consideration, as well as of solutions of other parabolic equations obtained as a result of a "nonlinear perturbation" of the original equation.

In Ch. IV we shall show that this self-similar solution is asymptotically stable not only with respect to small perturbations of the boundary function. as in (25), but also to perturbations of the nonlinear operator of the equation. that is, of the thermal conductivity coeflicienl. 1I,,1 I, IT = (onst > O. (I) •• •• •• •• •• •• •• •• •• •• • •• • •• •• •• •• •• .! •• •• •• •• •• •• •• •• ••• • •• •• •• ••• •e• •• •• ••• •• •• •e, •• § 4 II Some quasi Iinear pambol ie equations 62 Let n be a bounded domain in R N with a sufficiently smooth boundary that in n an initial heat perturbation is given, 11(0, x) = lIoCr) :: 0, x E n; II;~ I' E C(O) n an.

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