KIBU2021-08-302021-08-302021-02-17http://erepository.kibu.ac.ke/handle/123456789/2929MAT 824:Operator theory 1enAttribution-NonCommercial-ShareAlike 3.0 United Stateshttp://creativecommons.org/licenses/by-nc-sa/3.0/us/MAT 824:Operator theory 1Operator theory 1MAT 824Other