Holgate, D. B.Meyer, J. H.Jansen, Renier Stefan2021-02-092021-02-092020-01http://hdl.handle.net/11660/10949Abstract not availableenThesis (Ph.D. (Mathematics and Applied Mathematics))--University of the Free State, 2020Category theoryConstant morphismsDual closure operatorsLeft and right constant subcategoriesCassidy Hebert Kelly dual closure operatorAdjunctionsMATM 9100 dual closure operators on a category and their applicationsThesisUniversity of the Free State