On topological groups via a-local functions

Wadei Al-Omeri

Malaysia

Universiti Kebangsaan Malaysia

Mohd. Salmi Md. Noorani

Malaysia

University Kebangsaan Malaysia

A. Al-Omari

Jordan

Al al-Bayt University

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Accepted: 2014-01-30

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Published: 2014-02-04

DOI: https://doi.org/10.4995/agt.2014.2126
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Keywords:

ℜa-homeomorphism, topological groups, a-local function, ideal spaces, ℜa-operator, A∗-homeomorphism

Supporting agencies:

This research was not funded

Abstract:

An ideal on a set X is a nonempty collection of subsets
of X which satisfies the following conditions (1)A ∈ I and B ⊂ A implies B ∈ I; (2) A ∈ I and B ∈ I implies A ∪ B ∈ I. Given a topological space (X; ) an ideal I on X and A ⊂ X, ℜa(A) is defined as ∪{U ∈ a : U − A ∈ I}, where the family of all a-open sets of X forms a topology [5, 6], denoted by a. A topology, denoted a 
, finer than a is generated by the basis (I; ) = {V − I : V ∈ a(x); I ∈ I}, and a topology, denoted ⟨ℜa( )⟩ coarser than a is generated by the basis â„œa( ) = {ℜa(U) : U ∈ a}. In this paper A bijection f : (X; ; I) → (X; ;J ) is called a A∗-homeomorphism if f : (X; a ) → (Y; a ) is a
homeomorphism, ℜa-homeomorphism if f : (X;ℜa( )) → (Y;ℜa()) is a homeomorphism. Properties preserved by A∗-homeomorphism are studied as well as necessary and sufficient conditions for a ℜa-homeomorphism to be a A∗-homeomorphism.
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