Results 111 to 120 of about 17,323 (202)

Idempotents in symmetric semigroups

Journal of Combinatorial Theory, Series A, 1972
AbstractWe count the number of idempotent elements in a certain section of the s symmetric semigroup Sn on n letters. As a corollary of our result we have that every maximal principal right ideal of Sn contains ∑i=1n−1in−i−1(n−2i−1)+(n−1i) idempotent elements.
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A survey of s-unital and locally unital rings

Revista Integración, 2019
We gather some classical results and examples that show strict inclusion between the families of unital rings, rings with enough idempotents, rings with sets of local units, locally unital rings, s-unital rings and idempotent rings.
Patrik Nystedt
doaj  

Heegaard Floer homology for manifolds with torus boundary: properties and examples. [PDF]

Proc Lond Math Soc, 2022
Hanselman J, Rasmussen J, Watson L.
europepmc   +1 more source

Minimal idempotency, partial idempotency, search heuristics and constructive algorithms for idempotent integers

Publications mathématiques de Besançon. Algèbre et théorie des nombres
Previous work established the set of square-free integers n with at least one factorization n = p
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The boundary algebra of a GL _m -dimer. [PDF]

Commun Algebra, 2020
Andritsch L.
europepmc   +1 more source

A Full Nesterov-Todd Step Infeasible Interior-point Method for Symmetric Optimization in the Wider Neighborhood of the Central Path. [PDF]

Stat Optim Inf Comput, 2021
Lesaja G, Wang GQ, Oganian A.
europepmc   +1 more source

Idempotents for derangement numbers

Discrete Mathematics, 2003
The principal result of this paper locates a set of orthogonal idempotents in Solomon's descent algebra. The representations of the symmetric group arising from these idempotents have dimensions which are equal to the number of permutations with a particular number of fixed points.
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FREE SEMIGROUPS AND IDEMPOTENTS IN T [PDF]

Journal of Sciences, Islamic Republic of Iran, 1998
The known theory for an oid T shows how to find a subset T of ?T, which is a compact right topological semigroup [I]. The success of the methods in [2] for obtaining properties of-T has prompted us to see how successful they would be in another context.
doaj  

Grassmannians and Cluster Structures. [PDF]

Bull Iran Math Soc, 2021
Baur K.
europepmc   +1 more source

Random effects models for complex designs. [PDF]

Stat Methods Med Res, 2020
Jarrett RG, Farewell VT, Herzberg AM.
europepmc   +1 more source