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

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

The objective of the sequence is to offer new and critical advancements in natural and utilized arithmetic. good demonstrated in the neighborhood over twenty years, it bargains a wide library of arithmetic together with numerous vital classics.

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

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Extra resources for Blow-Up in Quasilinear Parabolic Equations (De Gruyter Expositions in Mathematics)

Sample text

Since Ilw(l, 1I1101l1-liRI An estimate of the effective width of the inhomogeneous temperature profile for large times is given by (21). In the next section we move on to analyze self-similar solutions of nonlinear heat equations. + 1/2 H I/2 Us(O)(1 + 7) 1/2: 7)(17. (20) Resolving consecutively all the indeterminacies that arise in the right-hand using the equality § 3 Asymptotic stability of self-similar solutions of nonlinear heat equations we obtain Let us consider flrst the example of a sclf-similar solution already encountered in Ch.

Since. as follows from (17), " IIw(I. 10 T)",- 112 + In this section we consider the Cauchy problem for the heat equation. Cd (\ + T)/11 J dT. II, :::;: U". t > O. x E (\) R. (28) o which is the same as (24). 11(0. x) :::;: 1I0(X) :::: O. x E R; 110 E (2) C(R). where the initial function has finite energy: Remark. The estimate (24) holds for sufficiently arbitrary (non-monotone in x) initial functions 110 E /}(R,). such that () ::: 11(1 ::: 110 ::: II;~ in R j , . where II~ are monotone functions, lI(f (0) :::;: III (0).

4) Here T > 0 is an arbitrary constant. Substituting this expression into ( I ) and taking into consideration the boundary condition, we obtain for Is :: 0 the following elliptic problem: (::"f~11 I + -Is = 0, x IT E U; I(x) = D, x E an. (5) For any IT > 0 it has a unique solution, strictly positive in n (existence of the solution can be established. for example, by constructing sub- and supersolutions of the problem; sec 17, 211) It turns out that (4) is stable with respect to arbitrary bounded perturbations of the initial function 1I0(X).

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