Pointfree topology version of image of real-valued continuous functions

سال انتشار: 1397
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 217

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شناسه ملی سند علمی:

JR_CGASAT-9-1_004

تاریخ نمایه سازی: 23 شهریور 1400

چکیده مقاله:

Let { \mathcal{R}} L be the ring of real-valued continuous functions on a frame L as the pointfree  version of C(X), the ring of all real-valued continuous functions on a topological space X. Since C_c(X) is the largest subring of C(X) whose elements have countable image, this motivates us to present the pointfree  version of C_c(X).The main aim of this paper is to present the pointfree version of image of real-valued continuous functions in {\mathcal{R}} L. In particular, we will introduce the pointfree version of the ring C_c(X). We define a relation from {\mathcal{R}} L into the power set of \mathbb R, namely overlap . Fundamental properties of this relation are studied. The relation overlap is a pointfree version of the relation defined as \mathop{\hbox{Im}} (f) \subseteq S for every continuous function f:X\rightarrow\mathbb R and S \subseteq \mathbb R.

کلیدواژه ها:

frame ، ring of real-valued continuous functions ، countable image ، f-ring

نویسندگان

Abolghasem Karimi Feizabadi

Department of Mathematics, Gorgan Branch, Islamic Azad University, Gorgan, Iran.

Ali Akbar Estaji

Faculty of Mathematics and Computer Sciences, Hakim Sabzevari University, Sabzevar, Iran.

Maryam Robat Sarpoushi

Faculty of Mathematics and Computer Sciences,Hakim Sabzevari University, Sabzevar, Iran.

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