KIBU2022-03-072022-03-072021-07-12http://erepository.kibu.ac.ke/handle/123456789/4473MAT 824:Operator theory IenAttribution-NonCommercial-ShareAlike 3.0 United Stateshttp://creativecommons.org/licenses/by-nc-sa/3.0/us/MAT 824:Operator theory IOperator theory IMAT 824Other