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- Surjeet Singh, Fawzi A. Al-Thukair
- Int. J. Math. Mathematical Sciences
- 2004

Let X, X′ be two locally finite, preordered sets and let R be any indecomposable commutative ring. The incidence algebra I(X,R), in a sense, represents X, because of the wellknown result that if the rings I(X,R) and I(X′,R) are isomorphic, then X and X′ are isomorphic. In this paper, we consider a preordered set X that need not be locally finite but has the… (More)

- Surjeet Singh, Fawzi A. Al-Thukair
- Int. J. Math. Mathematical Sciences
- 2005

Let X be any partially ordered set, R any commutative ring, and T = I * (X,R) the weak incidence algebra of X over R. Let Z be a finite nonempty subset of X, L(Z) = {x ∈ X : x z for some z ∈ Z}, and M = Te Z. Various chain conditions on M are investigated. The results so proved are used to construct some classes of right perfect rings that are not left… (More)

Considering a frame L, we introduce the notions of stratified L-semi-topological neighborhood group, stratified L-quasi-topological neighborhood group, and stratified L-quasi-bi-topological neighborhood group. In so doing, we look at the notion of stratified L-right (left) semi-topological neighborhood group, provide some basic facts, and present a… (More)

We study a Gaussian matrix function of the adjacency matrix of artificial and real-world networks. We motivate the use of this function on the basis of a dynamical process modeled by the time-dependent Schrödinger equation with a squared Hamiltonian. In particular, we study the Gaussian Estrada index-an index characterizing the importance of eigenvalues… (More)

- Fawzi A. Al-Thukair, Andrzej Pelc, Ivan Rival, Jorge Urrutia
- SIAM J. Discrete Math.
- 1991

Ordered sets are used as a computational model for motion planning problems. Every ordered set has a two-directional point representation using subdivisions. These subdivision points correspond to direction changes along the path of motion. AMS subject classifications (1980). 06A10, 52A37, 68E10.

- T. M. G. Ahsanullah, Fawzi A. Al-Thukair
- Int. J. Math. Mathematical Sciences
- 2004

We introduce the notion of N-topo nilpotent fuzzy set in a fuzzy neighborhood ring and develop some fundamental results. Here we show that a fuzzy neighborhood ring is locally inversely bounded if and only if for all 0 < α < 1, the α-level topological rings are locally inversely bounded. This leads us to prove a characterization theorem which says that if a… (More)

- T. M. G. Ahsanullah, David Gauld, Jawaher Al-Mufarrij, Fawzi A. Al-Thukair
- Fuzzy Sets and Systems
- 2014

- T. M. G. Ahsanullah, Fawzi A. Al-Thukair
- Int. J. Math. Mathematical Sciences
- 2004

We generalize min-neighborhood groups to arbitrary T -neighborhood groups, where T is a continuous triangular norm. In particular, we point out that our results accommodate the previous theory on min-neighborhood groups due to T. M. G. Ahsanullah. We show that every T -neighborhood group is T -uniformizable, therefore, T -completely regular. We also present… (More)

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