Let FG be the group algebra of a finite 2-group G over a finite field F of characteristic two and let ⊛ be an involution that arises from G. The ⊛-unitary subgroup of FG is denoted by V⊛(FG) and defined as the set of all normalized units u satisfying the property u⊛ = u−1. We establish the order of V⊛(FG) for all involutions ⊛ arising from G, where G is a finite cyclic 2-group, and show that all ⊛-unitary subgroups of FG are not isomorphic.
Similar content being viewed by others
References
Z. Balogh and A. Bovdi, “On units of group algebras of 2-groups of maximal class,” Comm. Algebra, 32, No. 8, 3227–3245 (2004).
Z. Balogh, L. Creedon, and J. Gildea, “Involutions and unitary subgroups in group algebras,” Acta Sci. Math. (Szeged), 79, No. 3-4, 391–400 (2013).
A. Bovdi, “The group of units of a group algebra of characteristic p,” Publ. Math. Debrecen, 52, No. 1-2, 193–244 (1998).
A. Bovdi and L. Erdei, “Unitary units in modular group algebras of groups of order 16,” Tech. Rep., Univ. Debrecen, L. Kossuth Univ., 4, No. 157, 1–16 (1996).
A. Bovdi and L. Erdei, “Unitary units in modular group algebras of 2-groups,” Comm. Algebra, 28, No. 2, 625–630 (2000).
A. Bovdi and A. Szakács, “Units of commutative group algebra with involution,” Publ. Math. Debrecen, 69, No. 3, 291–296 (2006).
A. A. Bovdi, “Unitarity of the multiplicative group of an integral group ring,” Mat. Sb. (N.S.), 119(161), No. 3, 387–400 (1982).
A. A. Bovdi and A. A. Sakach, “The unitary subgroup of the multiplicative group of the modular group algebra of a finite Abelian p-group,” Mat. Zametki, 45, No. 6, 23–29 (1989).
A. A. Bovdi and A. Szakács, “A basis for the unitary subgroup of the group of units in a finite commutative group algebra,” Publ. Math. Debrecen, 46, No. 1-2, 97–120 (1995).
V. Bovdi and L. G. Kovács, “Unitary units in modular group algebras,” Manuscripta Math., 84, No. 1, 57–72 (1994).
V. Bovdi and A. L. Rosa, “On the order of the unitary subgroup of a modular group algebra,” Comm. Algebra, 28, No. 4, 1897–1905 (2000).
V. Bovdi and T. Rozgonyi, “Unitary units in modular group algebras,” Acta. Acad. Paed. Nyiregyháza, 84, No. 1, 57–72 (1994).
V. A. Bovdi and A. N. Grishkov, “Unitary and symmetric units of a commutative group algebra,” Proc. Edinburgh Math. Soc., 62, No. 3, 641–654 (2019).
L. Creedon and J. Gildea, “Unitary units of the group algebra F2kQs,” Internat. J. Algebra Comput., 19, No. 2, 283–286 (2009).
L. Creedon and J. Gildea, “The structure of the unit group of the group algebra F2kQs,” Canad. Math. Bull., 54, No. 2, 237–243 (2011).
D. S. Dummit and R. M. Foote, Abstract Algebra, John Wiley & Sons, Hoboken (2004).
The GAP Group, GAP — Groups, Algorithms, and Programming, Version 4.10.2 (2019).
K. Ireland and M. Rosen, A Classical Introduction to Modern Number Theory, Springer, New York (1990).
G. T. Lee, S. K. Sehgal, and E. Spinelli, “Group rings whose unitary units are nilpotent,” J. Algebra, 410, 343–354 (2014).
G. T. Lee, S. K. Sehgal, and E. Spinelli, “Bounded Engel and solvable unitary units in group rings,” J. Algebra, 501, 225–232 (2018).
N. Makhijani, R. Sharma, and J. Srivastava, “On the order of unitary subgroup of the modular group algebra F2kD2N,” J. Algebra Appl., 14, No. 8, 1550129-1–1550129-10 (2015).
S. P. Novikov, “Algebraic construction and properties of Hermitian analogs of K-theory over rings with involution from the viewpoint of Hamiltonian formalism. Applications to differential topology and the theory of characteristic classes, I. II,” Izv. Akad. Nauk SSSR, Ser. Mat., 34, 253–288, 475–500 (1970).
Author information
Authors and Affiliations
Corresponding author
Additional information
Translated from Ukrains’kyi Matematychnyi Zhurnal, Vol. 72, No. 6, pp. 751–757, June, 2020. Ukrainian DOI: 10.37863/umzh.v72i6.1068.
Rights and permissions
About this article
Cite this article
Balogh, Z., Laver, V. Unitary Subgroups of Commutative Group Algebras of the Characteristic Two. Ukr Math J 72, 871–879 (2020). https://doi.org/10.1007/s11253-020-01829-3
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11253-020-01829-3