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Research Paper | Mathematics | Iraq | Volume 6 Issue 2, February 2017
Supra-Approximation Spaces Using Mixed Degree Systems in Graph Theory
Dr. Y. Y. Yousif | S. S. Obaid [2]
Abstract: This paper is concerned with introducing and studying the o-space by using out degree system (resp. i-space by using in degree system) which are the core concept in this paper. In addition, the m-lower approximations, the m-upper approximations and o-space and i-space. Furthermore, we introduce near supraopen (near supraclosed) d. g. 's. Finally, the supra-lower approximation, supra-upper approximation, supra-accuracy are defined and some of its properties are investigated.
Keywords: o-space, i-space, supra-approximation space, near supra-approximation space, m-lower approximation and m-upper approximation
Edition: Volume 6 Issue 2, February 2017,
Pages: 1501 - 1514
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