Geodesic
Holomorphic degenerate operator semigroups and evolutionary Sobolev type equations in quasi-Sobolev spaces of sequences
Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 7 (2015) no. 4, pp. 27-36
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The interest to Sobolev type equations has significantly increased recently, moreover, the need occured to consider them in quasi-Banach spaces. This need is explained not by the desire to enrich the theory but rather by the aspiration to comprehend non-classical models of mathematical physics in quasi-Banach spaces. It should be noted that Sobolev type equations are called evolutionary, provided their solutions exist only on $R_+$. The theory of holomorphic degenerate semigroups of operators constructed earlier in Banach and Frechet spaces is transferred to quasi-Sobolev spaces of sequences. Besides the introduction and references the paper contains four paragraphs. In the first, quasi-Banach spaces and linear bounded and closed operators defined on them are considered. Quasi-Sobolev spaces and powers of the Laplace quasi-operator are also taken into consideration. In the second paragraph polynomials of the Laplace quasi-operator are considered for operators $L$ and $M$ and conditions for the existence of degenerate holomorphic operator semigroups in quasi-Banach spaces of sequences are obtained. In other words, the first part of the generalization of the Solomyak–Iosida theorem to quasi-Banach spaces of sequences is stated. In the third paragraph the phase space of the homogeneous equation is constructed. The last paragraph investigates the “quasi-Banach” analogue of the homogeneous Dirichlet problem in a bounded domain with a smooth boundary for the linear Dzektser equation.
Keywords: holomorphic degenerate semigroups; quasi-Banach spaces; Dzektser equation; quasi-Sobolev spaces. 
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A. A. Zamyshlyaeva; J. K. T. Al-Isawi. Holomorphic degenerate operator semigroups and evolutionary Sobolev type equations in quasi-Sobolev spaces of sequences. Vestnik Ûžno-Uralʹskogo gosudarstvennogo universiteta. Seriâ, Matematika, mehanika, fizika, Tome 7 (2015) no. 4, pp. 27-36. http://geodesic.mathdoc.fr/item/VYURM_2015_7_4_a3/

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