Denjoy Integration in Abstract Spaces

Donald W. Solomon

Jan. 1969 · American Mathematical Soc.

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From the author's introduction: "We introduce a general method for defining Denjoy type integrals of point functions with domain in a second-countable, locally compact metric space, and range contained in an arbitrary real or complex Banach space. The general discussion given is primarily constructive in nature, with a view toward related descriptive type definitions, which are available under proper circumstances. Use is made of P. I. Romanovskiĭ's (1941) collection of sets, the members of which we refer to as 'fundamental sets'. We restrict our work to spaces on which a regular, real-valued, non-negative measure is defined. A discussion is given of some special cases of the general integral. A crucial part of this study is the differentiability of fundamental-set functions taking on values in a Banach space. We shall be interested in differentiability relative to one of the measures mentioned above. Three types of differentiation are discussed: strong differentiation, weak differentiation and pseudo-differentiation. The definition of each of these processes is a generalization of the definition of the corresponding process in more special cases."