Abbas Ali (1299) creator text Islamabad (Unpublished) 2022 monographic x, 217 p. : ill. ; 30 cm. +CD Submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy in Mathematics to the Department of Basic Sciences. Includes bibliographical references. Thesis supervisor: Dr. Noor Rehman Thesis (Ph.D)--Riphah International University, 2022 English Mathematics Deja conflict anaylsis model Sun and ma's algoritm Fuzzy preference relation Class ratio DBS FEAS 510 ABB