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Involutions and unitary subgroups in group algebras
Springer Science and Business Media LLC - Tập 79 - Trang 391-400 - 2013
Zsolt Balogh, Leo Creedon, Joe Gildea
Let FG be the group algebra of a finite group G over a field F of characteristic p. We give the maximal number of the non-isomorphic unitary subgroups with respect to the involutions of FG which arise from G. Furthermore, we characterize the group algebras with Hamiltonian unitary subgroup under the canonical involution, where G is a finite p-group and F is a finite field of characteristic p. Let ...... hiện toàn bộ
Composition series in groups and the structure of slim semimodular lattices
Springer Science and Business Media LLC - Tập 79 - Trang 369-390 - 2013
Gábor Czédli, E. Tamás Schmidt
Let $$\overrightarrow{H}$$ and $$\overrightarrow{K}$$ be finite composition series of a group G. The intersections Hi ∩ Kj of their members form a lattice CSL( $$...... hiện toàn bộ
Asymptotics of nearly critical Galton-Watson processes with immigration
Springer Science and Business Media LLC - Tập 77 - Trang 681-702 - 2011
Péter Kevei
We investigate the inhomogeneous Galton-Watson processes with immigration, where πn, the offspring means in the nth generation, tends to 1. We show that if the second derivatives of the offspring generating functions go to 0 rapidly enough, then the asymptotics are the same as in the INAR(1) case, treated in [4]. We also determine the limit if this assumption does not hold showing the optimality o...... hiện toàn bộ
Béla Szőkefalvi-Nagy Medal 2023
Springer Science and Business Media LLC - Tập 89 - Trang 317-318 - 2023
Nhóm tự đẳng cấu của các khoảng điều hành Dịch bởi AI
Springer Science and Business Media LLC - Tập 84 - Trang 125-136 - 2018
Peter Šemrl
Những mô tả đã biết về các nhóm tự đẳng cấu của các khoảng điều hành là rất đơn giản, với một ngoại lệ duy nhất: có hai kết quả đã biết mô tả dạng tổng quát của các tự đẳng cấu của đại số tác động và cả hai đều trông khá phức tạp. Mục tiêu của bài báo này là chỉ ra rằng nhóm tự đẳng cấu của đại số tác động là đồng nhất với nhóm tự đẳng cấu của bất kỳ khoảng điều hành thích hợp nào khác. Sau khi ch...... hiện toàn bộ
On operators with closed ranges
Springer Science and Business Media LLC - Tập 77 - Trang 579-587 - 2011
Zsigmond Tarcsay
We characterize those subpositive operators for which their Krein-von Neumann extension has closed range, moreover we construct their Moore-Penrose inverse. Our treatment follows as a tool the factorization approach to the extension theory of positive operators. As addition we give a short proof of Dixmier’s theorem that a bounded positive operator A and its square root A1/2 have the same range if...... hiện toàn bộ
z-ideals in lattices
Springer Science and Business Media LLC - Tập 85 - Trang 59-68 - 2019
Vinayak Joshi, Shubhangi Kavishwar
In this paper, we define z-ideals in bounded lattices. A separation theorem for the existence of prime z-ideals is proved in distributive lattices. As a consequence, we prove that every z-ideal is the intersection of some prime zideals. Lastly, we prove a characterization of dually semi-complemented lattices.
Improvement of convergence rate for the Móricz process
Springer Science and Business Media LLC - Tập 76 - Trang 471-486 - 2010
Xianliang Shi, Haiying Zhang
In 2003, F. Móricz proved that the jumps of a periodic function at its simple discontinuities can be determined by its conjugate Abel-Poisson mean. Later Q. L. Shi and X. L. Shi introduced the concentration factors method of Abel-Poisson type and established a criterion for functions that satisfied a condition of Dini type. For piecewise smooth functions the convergence rate of this method is usua...... hiện toàn bộ
CM-ideals and L1-matricial split faces
Springer Science and Business Media LLC - - 2019
Anindya Ghatak, Anil Kumar Karn
Notes on the characterization of derivations
Springer Science and Business Media LLC - Tập 78 - Trang 137-145 - 2012
Eszter Gselmann
Although the characterization of ring derivations has an extensive literature, up to now, all of the characterizations have had the following form: additivity and another property imply that the function in question is a derivation. The aim of this note is to point out that derivations can be described via a single equation.
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