Bibliographies thématiques / Subnormalità

Littérature scientifique sur le sujet « Subnormalità »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Subnormalità"

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Ben Taher, R., et M. Rachidi. « The Near Subnormal Weighted Shift and Recursiveness ». International Journal of Analysis 2013 (27 mars 2013) : 1–4. http://dx.doi.org/10.1155/2013/397262.

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We aim at studying the near subnormality of the unilateral weighted shifts, whose moment sequences are defined by linear recursive relations of finite order. Using the basic properties of recursive sequences, we provide a natural necessary condition, that ensure the near subnormality of this important class of weighted shifs. Some related new results are established; moreover, applications and consequences are presented; notably the notion of near subnormal completion weighted shift is implanted and explored.
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Szymanski, Waclaw. « Dilations and Subnormality ». Proceedings of the American Mathematical Society 101, no 2 (octobre 1987) : 251. http://dx.doi.org/10.2307/2045991.

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Szymański, Wacław. « Dilations and subnormality ». Proceedings of the American Mathematical Society 101, no 2 (1 février 1987) : 251. http://dx.doi.org/10.1090/s0002-9939-1987-0902537-9.

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Insel, A. « Levels of Subnormality ». Linear Algebra and its Applications 262, no 1-3 (1 septembre 1997) : 27–53. http://dx.doi.org/10.1016/s0024-3795(96)00466-1.

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Insel, Arnold J. « Levels of subnormality ». Linear Algebra and its Applications 262 (septembre 1997) : 27–53. http://dx.doi.org/10.1016/s0024-3795(97)80021-3.

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Kemoto, Nobuyuki. « Subnormality in ω12 ». Topology and its Applications 122, no 1-2 (juillet 2002) : 287–96. http://dx.doi.org/10.1016/s0166-8641(01)00149-3.

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Demanze, Olivier. « On Subnormality and Formal Subnormality for Tuples of Unbounded Operators ». Integral Equations and Operator Theory 46, no 3 (juillet 2003) : 267–84. http://dx.doi.org/10.1007/s00020-002-1141-8.

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CRAWFORD, NICK. « SELF CONCEPT AND SUBNORMALITY ». Journal of the Institute of Mental Subnormality (APEX) 4, no 1 (26 août 2009) : 29–30. http://dx.doi.org/10.1111/j.1468-3156.1976.tb00219.x.

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Tizard, J. « PROGNOSIS AND MENTAL SUBNORMALITY ». Developmental Medicine & ; Child Neurology 4, no 6 (12 novembre 2008) : 648–51. http://dx.doi.org/10.1111/j.1469-8749.1962.tb04162.x.

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Woolf, P. Grahame. « Subnormality Services in Sweden ». Developmental Medicine & ; Child Neurology 12, no 4 (12 novembre 2008) : 525–30. http://dx.doi.org/10.1111/j.1469-8749.1970.tb01955.x.

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Thèses sur le sujet "Subnormalità"

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Allen, Peter S. « Subnormality, ascendancy and projectivities ». Thesis, University of Warwick, 1987. http://wrap.warwick.ac.uk/99117/.

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In 1939, Wielandt introduced the concept of subnormality and proved that in a finite group, the join of the two (and hence any number of) subnormal subgroups is again subnormal. This result does not hold for arbitrary groups. After much work by various authors, Williams gave necessary and sufficient conditions for the join of two subgroups to be subnormal in any group in which they are each subnormally embedded; a sufficient condition is that the two subgroups permute (i.e. their join is their product). This present work arises from considering what in some sense is the dual situation to the above, namely: given a group G with subgroups H and K , both of which contain X as a subnormal subgroup, we ask under what conditions is X subnormal in the join < H,K > of H and K? It makes sense here to assume that G = < H,K > , so we do. We will say that G is a J-group if whenever G = < H,K > and X are as posed, it is true that X is subnormal in G . Unfortunately, apart from obvious classes such as nilpotent groups, J-groups do not seem to exist in abundance: Example 1.1 (due to Wielandt) shows that not even all finite groups are J-groups. Even worse, this example has the finite group G being soluble (of derived length 3) with X central in H (in fact H 1s cyclic). All this does not seem to bode well for trying to find many infinite J-groups (although whether metabelian groups are J-groups is an open problem). However, Wielandt shows that, if we require that the J-group criteria for a group G is satisfied only when H and K permute — in which case we say that G is a ω-group — then every finite group is indeed a ω-group (Theorem 1.3 here). The soluble case of this result is due to Maier. Our aim in this work is to develop Theorem 1.3 in (principally) three directions, a chapter being devoted to each.
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Gold, Catharine Ann. « Subnormality and soluble factorised groups ». Thesis, University of Warwick, 1989. http://wrap.warwick.ac.uk/100929/.

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Throughout this summary the group G = AXB is always a product of three abelian subgroups A, X and B. In Chapter 1 we study finite 2-groups G, where A and B are elementary and X has order 2. We also assume that X normalises both A and B, and thus AX and XB are nilpotent of class at most 2. We show that when the order of G divides 213 then G has derived length at most 3 ((1.4.2) and (1.6.1)). This supports the conjecture [see Introduction] on the derived length of a group which is expressible as the product of two nilpotent subgroups. In Chapter 2 we consider some special cases of G where A, X and B are finite p-groups and X is cyclic. We obtain a bound for the derived length of G which is independent of the prime p and the order of X. In Chapter 3 we find a bound for the derived length of a finite group G in terms of the highest power of a prime dividing the order of X when Ax = A, Bx = B and X is subnormal in both AX and XB. The most general result is Theorem (3.5.1). If G is a finite p-group and X has order p we show that G has derived length at most 4 (Theorem (3.3.1)). Further in Chapter 3 if Ax « A, Bx = B, X < m AX and X < m XB then a bound for the subnormal defect of X in G is given. When X has order p this bound depends only upon m (see (3.3.4)), and when X has order pn and m is fixed then the subnormal defect of X in G can be bounded in terms of n (see the remark following Proposition (3.4.2)). Chapter 4 shows how some results from Chapters 2 and 3 can be generalised to infinite groups. Theorem (4.3.1) shows that when A and B are p- groups of finite exponent, X has order pn, Ax = A, Bx = B, X < 2 AX and X < 2 XB then G is a locally finite group. Proposition (4.2.2) and Corollary (4.2.3) then enable some of the results about finite groups to be applied.
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Mallon, J. R. « The epidemiology of severe subnormality in Northern Ireland ». Thesis, University of Ulster, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378775.

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Narciso, Maria. « Reticoli di sottogruppi ». Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/22172/.

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Il risultato di questa tesi caratterizza i gruppi il cui reticolo dei sottogruppi è distributivo. Tali gruppi sono precisamente i gruppi localmente ciclici. Oltre a descrivere alcuni risultati preliminari sui reticoli e sui sottogruppi di composizione di un gruppo, si descrivono anche alcuni reticoli modulari di sottogruppi.
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Lisi, Francesca. « Una condizione di subnormalità generalizzata per gruppi finiti ». Doctoral thesis, 2021. http://hdl.handle.net/2158/1239038.

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Hota, Tapan Kumar. « Subnormality and Moment Sequences ». Thesis, 2012. http://hdl.handle.net/2005/3242.

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In this report we survey some recent developments of relationship between Hausdorff moment sequences and subnormality of an unilateral weighted shift operator. Although discrete convolution of two Haudorff moment sequences may not be a Hausdorff moment sequence, but Hausdorff convolution of two moment sequences is always a moment sequence. Observing from the Berg and Dur´an result that the multiplication operator on Is subnormal, we discuss further work on the subnormality of the multiplication operator on a reproducing kernel Hilbert space, whose kernel is a point-wise product of two diagonal positive kernels. The relationship between infinitely divisible matrices and moment sequence is discussed and some open problems are listed.
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Lee, Feng-Chang, et 李豐昌. « On Subnormality For Non-normal matrices ». Thesis, 2005. http://ndltd.ncl.edu.tw/handle/30711983082664548772.

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碩士
國立成功大學
數學系應用數學碩博士班
93
In this thesis, we study the extension properties of a bounded linear transformation from a subspace of a Hilbert space into the whole space (e.g., which has a normal extension N). Given an nxn non-normal matrix A and a kxn matrix B, we obtain some characters of subnormality for the submatrix M(A,B) by means of the geometric behavior of W(N) and W(A).
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Kumar, Sumit. « Normal Spectrum of a Subnormal Operator ». Thesis, 2013. http://hdl.handle.net/2005/3289.

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Let H be a separable Hilbert space over the complex field. The class S := {N|M : N is normal on H and M is an invariant subspace for Ng of subnormal operators. This notion was introduced by Halmos. The minimal normal extension Ň of a subnormal operator S was introduced by σ (S) and then Bram proved that Halmos. Halmos proved that σ(Ň) (S) is obtained by filling certain number of holes in the spectrum (Ň) of the minimal normal extension Ň of a subnormal operator S. Let σ (S) := σ (Ň) be the spectrum of the minimal normal extension Ň of S; which is called the normal spectrum of a subnormal operator S: This notion is due to Abrahamse and Douglas. We give several well-known characterization of subnormality. Let C* (S1) and C* (S2) be the C*- algebras generated by S1 and S2 respectively, where S1 and S2 are bounded operators on H: Next we give a characterization for subnormality which is purely C - algebraic. We also establish an intrinsic characterization of the normal spectrum for a subnormal operator, which enables us to answer the fol-lowing two questions. Let II be a *- representation from C* (S1) onto C* (S2) such that II(S1) = S2. If S1 is subnormal, then does it follow that S2 is subnormal? What is the relation between σ (S1) and σ (S2)? The first question was asked by Bram and second was asked by Abrahamse and Douglas. Answers to these questions were given by Bunce and Deddens.
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Livres sur le sujet "Subnormalità"

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Allen, Peter S. Subnormality, ascendency and projectivities. [s.l.] : typescript, 1987.

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Gold, C. A. Subnormality and soluble factorised groups. [s.l.] : typescript, 1989.

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Stochel, J. B. Weighted quasishifts, generalized commutation relation, and subnormality. Saarbrücken : Universität des Saarlandes, 1990.

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Mallon, John Rea. The epidemiology of severe subnormality in Northern Ireland. [s.l : The author], 1986.

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Associazione nazionale famiglie fanciulli subnormali, dir. Il coraggio di una vita normale. Milano : Sperling & Kupfer, 1999.

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Tomlinson, Sally. Educational Subnormality. Routledge, 2018. http://dx.doi.org/10.4324/9780429489983.

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Tomlinson, Sally. Educational Subnormality. Taylor & Francis Group, 2018.

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Tomlinson, Sally. Educational Subnormality. Taylor & Francis Group, 2020.

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Stochel, Jan, et Franciszek Hugon Szafraniec. Unbounded Operators and Subnormality. Taylor & Francis Group, 2023.

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Garrison, David James. Subnormality conditions in Metabelian Groups. 1995.

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Chapitres de livres sur le sujet "Subnormalità"

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Isaacs, I. « Subnormality ». Dans Graduate Studies in Mathematics, 45–64. Providence, Rhode Island : American Mathematical Society, 2008. http://dx.doi.org/10.1090/gsm/092/02.

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Budzyński, Piotr, Zenon Jabłoński, Il Bong Jung et Jan Stochel. « Subnormality : General Criteria ». Dans Lecture Notes in Mathematics, 33–55. Cham : Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-74039-3_3.

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Isaacs, I. « More on subnormality ». Dans Graduate Studies in Mathematics, 271–94. Providence, Rhode Island : American Mathematical Society, 2008. http://dx.doi.org/10.1090/gsm/092/09.

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Roman, Steven. « Homomorphisms, Chain Conditions and Subnormality ». Dans Fundamentals of Group Theory, 105–48. Boston : Birkhäuser Boston, 2011. http://dx.doi.org/10.1007/978-0-8176-8301-6_4.

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Szafraniec, Franciszek Hugon. « Multipliers in the Reproducing Kernel Hilbert Space, Subnormality and Noncommutative Complex Analysis ». Dans Reproducing Kernel Spaces and Applications, 313–31. Basel : Birkhäuser Basel, 2003. http://dx.doi.org/10.1007/978-3-0348-8077-0_11.

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Lennox, John C., et Derek J. S. Robinson. « SUBNORMALITY AND SOLUBILITY ». Dans The Theory of Infinite Soluble Groups, 275–89. Oxford University Press, 2004. http://dx.doi.org/10.1093/acprof:oso/9780198507284.003.0012.

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« Social Aspects of Subnormality ». Dans Put Away, 7–27. Routledge, 2017. http://dx.doi.org/10.4324/9781315127866-2.

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« Mental subnormality (mental handicap) ». Dans Signs of Stress, 117–28. Routledge, 2005. http://dx.doi.org/10.4324/9780203988145-15.

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Walker, Nigel. « Mental Subnormality and Illness ». Dans Crime and Punishment in Britain, 53–67. Routledge, 2017. http://dx.doi.org/10.4324/9780203794418-4.

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Maier, Rudolf R. « Permutability and subnormality of subgroups ». Dans Groups St Andrews 1989, 363–69. Cambridge University Press, 1991. http://dx.doi.org/10.1017/cbo9780511661846.009.

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Actes de conférences sur le sujet "Subnormalità"

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Szafraniec, Franciszek Hugon. « Subnormality and cyclicity ». Dans Topological Algebras, their Applications, and Related Topics. Warsaw : Institute of Mathematics Polish Academy of Sciences, 2005. http://dx.doi.org/10.4064/bc67-0-27.

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Szafraniec, Franciszek Hugon. « Subnormality versus restrictions ». Dans Perspectives in Operator Theory. Warsaw : Institute of Mathematics Polish Academy of Sciences, 2007. http://dx.doi.org/10.4064/bc75-0-23.

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Szafraniec, Franciszek Hugon. « Subnormality from bounded vectors ». Dans Perspectives in Operator Theory. Warsaw : Institute of Mathematics Polish Academy of Sciences, 2007. http://dx.doi.org/10.4064/bc75-0-22.

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