books.google.co.cr - The unifying approach of functional analysis is to view functions as points in some abstract vector space and the differential and integral operators relating these points as linear transformations on these spaces. The author presents the basics of functional analysis with attention paid to both expository...http://books.google.co.cr/books/about/Beginning_Functional_Analysis.html?hl=es&id=QALoZC64ea0C&utm_source=gb-gplus-shareBeginning Functional Analysis
