Rings with a certain condition on subsemigroups.
Ring-theoretic properties of Iwasawa algebras: a survey.
Robinson-Schensted correspondence for the signed Brauer algebras.
Robust neural network control of robotic manipulators via switching strategy
In this paper, a robust neural network control scheme for the switching dynamical model of the robotic manipulators has been addressed. Radial basis function (RBF) neural networks are employed to approximate unknown functions of robotic manipulators and a compensation controller is designed to enhance system robustness. The weight update law of the robotic manipulator is based on switched multiple Lyapunov function method and the periodically switching law which is suitable for practical implementation...
Root systems for two dimensional complex reflection groups.
Roots and logarithms of automorphisms of complete local rings.
Roots and Maximal Tori in Finite Forms of Semisimple Algebraic Groups.
Roots, iterations and logarithms of formal automorphisms.
Roots of doubly-infinite increasing sequences.
Roots of increasing sequences.
Roots of positive and negative operators on Wachs spaces
Rot-Quasigroups
Rot-quasigroups as isotopes of Abelian groups
Rough semigroups and rough fuzzy semigroups based on fuzzy ideals
In this paper, we firstly introduce a special congruence relation U(μ, t) induced by a fuzzy ideal μ in a semigroup S. Then we define the lower and upper approximations based on a fuzzy ideal in semigroups. We can establish rough semigroups, rough ideals, rough prime ideals, rough fuzzy semigroups, rough fuzzy ideals and rough fuzzy prime ideals according to the definitions of rough sets and rough fuzzy sets. Furthermore, we shall consider the relationships among semigroups and rough semigroups,...
R-S correspondence for and Klein-4 diagram algebras.
RSK bases and Kazhdan-Lusztig cells
From the combinatorial characterizations of the right, left, and two-sided Kazhdan-Lusztig cells of the symmetric group, “ RSK bases” are constructed for certain quotients by two-sided ideals of the group ring and the Hecke algebra. Applications to invariant theory, over various base rings, of the general linear group and representation theory, both ordinary and modular, of the symmetric group are discussed.
R-trees and the Bieri-Neumann-Strebel invariant.
Let G be a finitely generated group. We give a new characterization of its Bieri-Neumann-Strebel invariant Σ(G), in terms of geometric abelian actions on R-trees. We provide a proof of Brown's characterization of Σ(G) by exceptional abelian actions of G, using geometric methods.
R-unipotent congruences on regular semigroups.
RWPRI and flag-transitive linear spaces.