Rotich, Stanley Kiplagat2016-09-202016-09-202016-01http://ir-library.ku.ac.ke/handle/123456789/14986A research thesis submitted in partial fulfillment of the requirements for the award of the degree of doctor of philosophy (pure mathematics) in the school of pure and applied sciences of Kenyatta University. January 2016enCycle Indices, Subdegrees and Suborbital Graphs of PSL(2,Q) Acting on the Cosets of Some of its SubgroupsThesis