DEBRE MARKOS UNIVERSITY COLLEGE OF NATURAL AND COMPUTATIONAL SCIENCES DEPARTMENT OF MATHEMATICS THE ROLE OF HUMAN MOBILITY BETWEEN URBAN AND RURAL POPULATION TO HIV/AIDS DYNAMICS:a modeling perspective BY: WALLE TILAHUN ( GSR/1117/12) ADIVISOR : BEWKETU TESHALE (PhD) A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS OF THE AWARD OF THE DEGREE OF MASTER OF SCIENCE IN METHEMATICS December 15, 2021 DEBRE MARKOS, ETHIOPIA