Sharp bounds for finitely many embedded eigenvalues of perturbed Stark type operators
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DOI: 10.1002/mana.201800517
Abstract: For perturbed Stark operators $Hu=-u^{\prime\prime}-xu+qu$, the author has proved that $\limsup_{x\to \infty}{x}^{\frac{1}{2}}|q(x)|$ must be larger than $\frac{1}{\sqrt{2}}N^{\frac{1}{2}}$ in order to create $N$ linearly independent eigensolutions in $L^2(\mathbb{R}^+)$. In this paper, we apply generalized Wigner-von Neumann… read more here.
Keywords: sharp bounds; perturbed stark; finitely many; embedded eigenvalues ... See more keywords
Approximation theorems for spaces of localities
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DOI: 10.1007/s00209-020-02516-6
Abstract: The classical Artin–Whaples approximation theorem allows to simultaneously approximate finitely many different elements of a field with respect to finitely many pairwise inequivalent absolute values. Several variants and generalizations exist, for example for finitely many… read more here.
Keywords: finitely many; approximation theorems; theorems spaces; spaces localities ... See more keywords
Some trends in the theory of groups with finitely many normalizers
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DOI: 10.1007/s11587-019-00466-8
Abstract: This paper provides an account of results and methods from the theory of infinite groups admitting only finitely many normalizers of subgroups with a given property. Some new statements on this subject are also proved. read more here.
Keywords: groups finitely; finitely many; theory groups; trends theory ... See more keywords
Algebras with finitely many conjugacy classes of left ideals versus algebras of finite representation type
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DOI: 10.1016/j.jpaa.2019.01.010
Abstract: Let A be a finite dimensional algebra over an algebraically closed field with the radical nilpotent of index 2. It is shown that A has finitely many conjugacy classes of left ideals if and only… read more here.
Keywords: finite representation; finitely many; many conjugacy; classes left ... See more keywords
On groups covered by finitely many centralizers and domination number of the commuting graphs
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DOI: 10.1080/00927872.2019.1588977
Abstract: Abstract For a finite nonabelian group G, let be the smallest integer m such that G contains m proper centralizers with property In this article, we find for some groups of interest. For two isoclinic… read more here.
Keywords: domination number; finitely many; groups covered; many centralizers ... See more keywords
Uniqueness and Lipschitz stability in electrical impedance tomography with finitely many electrodes
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DOI: 10.1088/1361-6420/aaf6fc
Abstract: For the linearized reconstruction problem in Electrical Impedance Tomography (EIT) with the Complete Electrode Model (CEM), Lechleiter and Rieder (2008 Inverse Problems 24 065009) have shown that a piecewise polynomial conductivity on a fixed partition… read more here.
Keywords: finitely many; lipschitz stability; electrical impedance; impedance tomography ... See more keywords
Groups with finitely many non-isomorphic factor-groups
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DOI: 10.1142/s0219498821502236
Abstract: We prove that if [Formula: see text] is either a hypercentral-by-finite group or a soluble Baer group and if [Formula: see text] has finitely many non-isomorphic factor-groups, then [Formula: see text] is a Chernikov group.… read more here.
Keywords: non isomorphic; finitely many; isomorphic factor; many non ... See more keywords
Ring Extensions with Finitely Many Non-Artinian Intermediate Rings
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DOI: 10.1155/2020/7416893
Abstract: The commutative ring extensions with exactly two non-Artinian intermediate rings are characterized. An initial step involves the description of the commutative ring extensions with only one non-Artinian intermediate ring. read more here.
Keywords: artinian intermediate; intermediate rings; finitely many; ring extensions ... See more keywords