DEPENDENCES ATTRIBUTES OF INFORMATION SYSTEMS AND PROPERTIES OF UPPER APPROXIMATION BASED CLOSE FUNCCTION.

  • Trinh Thi Nhi Hung Yen University of Technology and Education
  • Nguyen Ba Tuong Hung Yen University of Technology and Education
Keywords: : Dependence attribute, information system, upper approximation, decision system, close function.

Abstract

This paper investigates some properties of dependence attributes in information systems. In the paper we have been proposed a closed mapping and consequently we have showed some properties and formulas of upper approximation.
Furthermore, it has been shown that single information system and set-value information system determine each other.

Published
2020-04-19
How to Cite
Trinh Thi Nhi, & Nguyen Ba Tuong. (2020). DEPENDENCES ATTRIBUTES OF INFORMATION SYSTEMS AND PROPERTIES OF UPPER APPROXIMATION BASED CLOSE FUNCCTION. UTEHY Journal of Science and Technology, 10, 69-72. Retrieved from http://tapchi.utehy.edu.vn/index.php/jst/article/view/285