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On Normal Subgroups of Product of Groups  [PDF]
Ashish Kumar Das
Mathematics , 2005,
Abstract: The object of this paper is to find a necessary and sufficient condition for the groups $G_1, G_2, ..., G_n$ so that every normal subgroup of the product $\prod_{i=1}^{n} G_i$ is of the type $\prod_{i=1}^{n} N_i$ with $N_i \trianglelefteq G_i$, $i=1,2, ..., n$. As a consequence we obtain a well-known result due to R. Remak about centreless completely reducible groups having finitely many direct factors.
On the Groups and Automorphism Groups of the Groups of order 64p without a Normal Sylow p-Subgroup  [PDF]
Walter Becker,Elaine W. Becker
Mathematics , 2013,
Abstract: The groups of order 64p without a normal sylow p-subgroup are listed, and their automorphism groups are also determined. As a by-product of our original effort to get these groups, we needed to determine the automorphism groups of those groups of order 64 with an odd-order automorphism. In view of the fact that we already had determined these groups and that these automorphism groups are not given explicitly in the literature, we have appended to this report these automorphism groups. In another project we were looking for new complete groups by following automorphism group towers up to completion when the computer memory allowed such followups. We did this for these groups of order 64. In another appendix we give the results of this work as applied to the groups of order 64.
On normal subgroups of an amalgamated product of groups with applications to knot theory  [PDF]
John G. Ratcliffe
Mathematics , 2009,
Abstract: In this paper, we give some necessary and sufficient conditions for a normal subgroup of an amalgamated product of groups to be finitely generated. We apply these conditions together with Stallings' fibering theorem to prove that an irreducible multilink in a homology 3-sphere fibers if and only if each of its multilink splice components fibers.
Intersecting free subgroups in free amalgamated products of two groups with normal finite amalgamated subgroup  [PDF]
Alexander Zakharov
Mathematics , 2011,
Abstract: We partly generalize the estimate for the rank of intersection of subgroups in free products of groups, proved earlier by S.V.Ivanov and W.Dicks, to the case of free amalgamated products of groups with normal finite amalgamated subgroup. We also prove that the obtained estimate is sharp and cannot be further improved when the amalgamated product contains an involution.
Notes on the hidden subgroup problem on some semi-direct product groups  [PDF]
Dong Pyo Chi,Jeong San Kim,Soojoon Lee
Physics , 2006,
Abstract: We consider the hidden subgroup problem on the semi-direct product of cyclic groups $\Z_{N}\rtimes\Z_{p}$ with some restriction on $N$ and $p$. By using the homomorphic properties, we present a class of semi-direct product groups in which the structures of subgroups can be easily classified. Furthermore, we show that there exists an efficient quantum algorithm for the hidden subgroup problem on the class.
The normal subgroup structure of ZM-groups  [PDF]
Marius Tarnauceanu
Mathematics , 2015,
Abstract: The main goal of this note is to determine and to count the normal subgroups of a ZM-group. We also indicate some necessary and sufficient conditions such that the normal subgroups of a ZM-group form a chain.
Quantum algorithm for the hidden subgroup problem on a class of semidirect product groups  [PDF]
Carlos Magno M. Cosme,Renato Portugal
Physics , 2007,
Abstract: We present efficient quantum algorithms for the hidden subgroup problem (HSP) on the semidirect product of cyclic groups $\Z_{p^r}\rtimes_{\phi}\Z_{p^2}$, where $p$ is any odd prime number and $r$ is any integer such that $r>4$. We also address the HSP in the group $\Z_{N}\rtimes_{\phi}\Z_{p^2}$, where $N$ is an integer with a special prime factorization. These quantum algorithms are exponentially faster than any classical algorithm for the same purpose.
A Subgroup of a Direct Product of Free Groups whose Dehn Function has a Cubic Lower Bound  [PDF]
Will Dison
Mathematics , 2007,
Abstract: We establish a cubic lower bound on the Dehn function of a certain finitely presented subgroup of a direct product of 3 free groups.
Reduction of UNil for finite groups with normal abelian Sylow 2-subgroup  [PDF]
Qayum Khan
Mathematics , 2006, DOI: 10.1016/j.jpaa.2008.07.005
Abstract: Let F be a finite group with a Sylow 2-subgroup S that is normal and abelian. Using hyperelementary induction and cartesian squares, we prove that Cappell's unitary nilpotent groups UNil_*(Z[F];Z[F],Z[F]) have an induced isomorphism to the quotient of UNil_*(Z[S];Z[S],Z[S]) by the action of the group F/S. In particular, any finite group F of odd order has the same UNil-groups as the trivial group. The broader scope is the study of the L-theory of virtually cyclic groups, based on the Farrell--Jones isomorphism conjecture. We obtain partial information on these UNil when S is a finite abelian 2-group and when S is a special 2-group.
A formula for the normal subgroup growth of Baumslag-Solitar groups  [PDF]
J. O. Button
Mathematics , 2007,
Abstract: We give an exact formula for the number of normal subgroups of each finite index in the Baumslag-Solitar group BS(p,q) when p and q are coprime. Unlike the formula for all finite index subgroups, this one distinguishes different Baumslag-Solitar groups and is not multiplicative. This allows us to give an example of a finitely generated profinite group which is not virtually pronilpotent but whose zeta function has an Euler product.
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