Results 261 to 270 of about 13,132,379 (283)
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The Automorphism Groups of the Braid Groups
American Journal of Mathematics, 1981In the first of two papers published in the Annals in 1947 [3] Emil Artin mentioned the problem of determining all automorphisms of the braid groups (of the Euclidean plane), and in the second [4] took a first step towards a solution. The main result of this paper is a complete determination of these automorphism groups: the outer automorphism group is
Dyer, Joan L., Grossman, Edna K.
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Science, 2011
The benefits of cooperation can drive the evolution of a population structure that supports cooperative behavior.
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The benefits of cooperation can drive the evolution of a population structure that supports cooperative behavior.
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The Clearing House: A Journal of Educational Strategies, Issues and Ideas, 1960
Fundamentally, it is impossible to escape some kind of grouping of students. At one end of the scale is random or what we call heterogeneous grouping. At the other end, there is ability or some other type of homogeneous grouping in all major subject areas. In between, it is a question of how much grouping for whom and in what subjects.
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Fundamentally, it is impossible to escape some kind of grouping of students. At one end of the scale is random or what we call heterogeneous grouping. At the other end, there is ability or some other type of homogeneous grouping in all major subject areas. In between, it is a question of how much grouping for whom and in what subjects.
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Proceedings of the 21st ACM international conference on Information and knowledge management, 2012
We formulate and investigate the novel problem of finding the skyline k-tuple groups from an n-tuple dataset - i.e., groups of k tuples which are not dominated by any other group of equal size, based on aggregate-based group dominance relationship. The major technical challenge is to identify effective anti-monotonic properties for pruning the search ...
Nan Zhang 0004 +4 more
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We formulate and investigate the novel problem of finding the skyline k-tuple groups from an n-tuple dataset - i.e., groups of k tuples which are not dominated by any other group of equal size, based on aggregate-based group dominance relationship. The major technical challenge is to identify effective anti-monotonic properties for pruning the search ...
Nan Zhang 0004 +4 more
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Groups, Groups of Groups, and Complex Stability
SSRN Electronic Journal, 2010Many politically and economically important groups are themselves comprised of groups. Examples of such multilevel group structures include coalition governments, labor confederations and multinational agreements. This paper develops a model of multilevel group structures.
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Stable Groups and Algebraic Groups
Journal of the London Mathematical Society, 2000Let \(G\) be a stable, saturated group, \(p\) be the strong type of an element of \(G\), and \(\langle p\rangle\) be the smallest type-definable (over \(\text{acl}(\emptyset)\)) subgroup of \(G\) containing \(p^G\). By \textit{L. Newelski}'s theorem [Notre Dame J. Formal Logic 32, No.
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Canadian Journal of Mathematics, 1995
AbstractLetL/Kbe a finite Galois extension in characteristic ≠ 2, and consider a non-split Galois theoretical embedding problem overL/Kwith cyclic kernel of order 2. In this paper, we prove that if the Galois group ofL/Kis the direct product of two subgroups, the obstruction to solving the embedding problem can be expressed as the product of the ...
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AbstractLetL/Kbe a finite Galois extension in characteristic ≠ 2, and consider a non-split Galois theoretical embedding problem overL/Kwith cyclic kernel of order 2. In this paper, we prove that if the Galois group ofL/Kis the direct product of two subgroups, the obstruction to solving the embedding problem can be expressed as the product of the ...
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Actions of abelian groups on groups
Journal of Group Theory, 2007Let G be a group and A a finitely generated abelian subgroup of Aut(G). If G is the union of a finitely many A-orbits then G is finite.
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