Operatorenkalkül über freien Monoiden II: Binominalsysteme.
Operatorenkalkül über freien Monoiden III: Lagrangeinversion und Sheffersysteme.
Operators , and in the classes of -semigroups and -semirings.
Orbit algebras and periodicity
Given an object in a category, we study its orbit algebra with respect to an endofunctor. We show that if the object is periodic, then its orbit algebra modulo nilpotence is a polynomial ring in one variable. This specializes to a result on Ext-algebras of periodic modules over Gorenstein algebras. We also obtain a criterion for an algebra to be of wild representation type.
Orbit algebras that are invariant under stable equivalences of Morita type
In this note we show that there are a lot of orbit algebras that are invariant under stable equivalences of Morita type between self-injective algebras. There are also indicated some links between Auslander-Reiten periodicity of bimodules and noetherianity of their orbit algebras.
Order completions of semiprime rings
Ordered ultraconnected rings
Ordering Epic R-Fields
Ordering of the Primitive Spectrum of a Semisimple Lie Algebra.
Orderings and preorderings in rings with involution
The notions of a preordering and an ordering of a ring R with involution are investigated. An algebraic condition for the existence of an ordering of R is given. Also, a condition for enlarging an ordering of R to an overring is given. As for the case of a field, any preordering of R can be extended to some ordering. Finally, we investigate the class of archimedean ordered rings with involution.
Orderings on semirings.
Orders, in non-Eichler (R)-algebras over global function fields, having the cancellation property.
Orders in quaternion algebras.
Orders of Global Dimension Two.
Ordinary selfdistributive rings
Left selfdistributive rings (i.e., ) which are semidirect sums of boolean rings and rings nilpotent of index at most 3 are studied.
Ordnungen von Quaternionenalgebren über lokalen Körpern.
Ordres de Gorenstein
Ore extensions over near pseudo-valuation rings.
Ore sets in enveloping algebras
Orthodox bands of modules