|Ph. D.: IM PAN 1973, habilitation: IM PAN 1985|
My areas of research are Measure Theory, Functional Analysis and Operator Theory. I am also interested in the history of 20th century mathematics. I am mainly concerned with extending additive set functions and operators on vector lattices and with constructions and properties of dense subspaces [resp. sublattices] of topological vector spaces [resp. lattices]. Some of my results on these subjects are included in several books and monographs (e.g., C. D. Aliprantis and O. Burkinshaw, Positive Operators, Academic Press, 1985; P. Pérez Carreras and J. Bonet, Barrelled Locally Convex Spaces, North-Holland, 1987).
Part of my more recent work is devoted to the variation of an additive function defined on a Boolean algebra and taking values in a Banach space or an Abelian normed group.
Referee for many Polish and foreign mathematical journals. Reviewer for Mathematical Reviews (1976--2004) and Zentralblatt für Mathematik (1981--2016).