4 papers
On the structure and skeletals of principal ideal graphs of inverse semigroups
C S Preenu, R S Indu, Sijo George
The principal left ideal graph of a semigroup is a simple graph whose vertices are the non-zero elements of the semigroup, and two vertices are adjacent if their principal left ide…
Semiring arising as Lattice of Groupsemirings
A. R. Rajan, S. Sheena, C. S. Preenu
Much study has been done on semigroups which are unions of groups. There are several ways in which a union of groups can be made into a semigroup in which each of the component gro…
Cross-connections in Clifford semigroups
P. A. Azeef Muhammed, C. S. Preenu
An inverse Clifford semigroup (often referred to as just a Clifford semigroup) is a semilattice of groups. It is an inverse semigroup and in fact, one of the earliest studied class…
Partial Order in the Normal Category Arising from Normal Bands
C S Preenu, A R Rajan, K S Zeenath
The notion of normal category was introduced by KSS Nambooripad in connection with the study of the structure of regular semigroups using cross connections\cite{nambooripad1994theo…