in a world, where globalization and industrial and technological progress are the most frequently heard voices, the persian gulf yet remains as an outstanding region for the most precious strategic reserves of the world. the persian gulf  harbors as the biggest reserves of the world are a major center for the production of oil and natural gas of the world. such an importance has turned the pers...

We construct a completely regular ordered space (X, T ,≤) such that X is an I-space, the topology T of X is metrizable and the bitopological space (X, T ♯,T ♭) is pairwise regular, but not pairwise completely regular. (Here T ♯ denotes the upper topology and T ♭ the lower topology of X.)

In 1968 Maarten Maurice was appointed full professor of pure mathematics with special emphasis on Topology at the Vrije Universiteit. As Maarten wrote his Ph. D. thesis on ordered spaces [8], it was only natural that a research group was founded working in that area. Maarten was a very inspiring teacher of mathematics at all levels. He attracted many students and as a result of that, under his ...

We present a way of topologizing sets of Galois types over structures in abstract elementary classes with amalgamation. In the elementary case, the topologies thus produced refine the syntactic topologies familiar from first order logic. We exhibit a number of natural correspondences between the model-theoretic properties of classes and their constituent models and the topological properties of...