supported in part by the NSFC(11671314);the Foundation of Hubei Provincial Department of Education(Q20161602);supported in part by the NSF-DMS(1200370);the NSFC(11628102)
In this article, we study the preservation properties of (Silov) boundary of mul-tiplieative subgroups in C(X) spaces for non-surjective norm-preserving multiplieative maps.We also show a sufficient condition for ...
supported by the Deanship of Scientific Research(DSR) at King Abdulaziz University(KAU) represented by the Unit of Research Groups through the grant number(MG/31/01) for the group entitled "Abstract Algebra and its Applications"
Let G be a finite group. A subgroup H of G is called an H-subgroup in G if NG(H)∩ H^g ≤ H for all g C G. A subgroup H of G is called a weakly H-subgroup in G if there exists a normal subgroup K of G such that G = ...
A subgroup H of a group G is called F-z-supplemented in G if there exists a subgroup K of G, such that G = HK and H∩K≤ Z∞F(G), where Z∞F(G) is the F-hypercenter of G. We obtain some results about the F-z-suppl...
The authors consider the extended Hecke groups H(γq) generated by T(z) = -1 / z, S(z) = -1(z +γq) and R(z) = 1 / z with A, = 2 cos(π/q) for q≥3 an integer. In this paper, the even subgroup He(γq), the second comm...