Reduction theory using semistability, II.
Reductive group actions with one-dimensional quotient
Reductive groups and regular semigroups.
Reduktive Automorphismengruppen analytischer C-Algebren.
Reedy categories which encode the notion of category actions
We study a certain type of action of categories on categories and on operads. Using the structure of the categories Δ and Ω governing category and operad structures, respectively, we define categories which instead encode the structure of a category acting on a category, or a category acting on an operad. We prove that the former has the structure of an elegant Reedy category, whereas the latter has the structure of a generalized Reedy category. In particular, this approach gives a new way to regard...
Rees quotients of N-semigroups.
Refinement Monoids, Vaught Monoids, and Boolean Algebras.
Reflection Groups and Orthogonal Polynomials on the Sphere.
Reflection loops of spaces with congruence and hyperbolic incidence structure
In an absolute space with congruence there are line reflections and point reflections. With the help of point reflections one can define in a natural way an addition + of points which is only associative if the product of three point reflection is a point reflection again. In general, for example for the case that is a linear space with hyperbolic incidence structure, the addition is not associative. is a K-loop or a Bruck loop.
Reflexive modules on quotient surface singularities.
Reg-strongly solid varieties of commutative semigroups
Regular 4-spiral semigroup, I.G. semigroups and the Rees construction.
Regular and simple Schur-semigroups.
Regular character tables of symmetric groups.
Regular ....-classes of semigroups of continua.
Regular Elements of Finite Reflection Groups.
Regular elements of the semigroup of all binary relations.
Regular generalized adjoint semigroups of a ring.
Regular geodesic languages and the falsification by fellow traveler property.
Regular, inverse, and completely regular centralizers of permutations
For an arbitrary permutation in the semigroup of full transformations on a set with elements, the regular elements of the centralizer of in are characterized and criteria are given for to be a regular semigroup, an inverse semigroup, and a completely regular semigroup.