Of regulated and steplike functions

Gadi Moran
1977 Transactions of the American Mathematical Society  
Let C denote the class of regulated real-valued functions on the unit interval vanishing at the origin, whose positive and negative jumps sum to infinity in every nontrivial subinterval of /. Goffman [2] showed that every / in C is (essentially) a sum g + s where g is continuous and s is steplike. In this sense, a function in C is like a function of bounded variation, that has a unique such g and i. The import of this paper is that for / in C the representation / = g + i is not only not unique,
more » ... but by far the opposite holds: g can be chosen to be any continuous function on / vanishing at 0, at the expense of a rearrangement of j.
doi:10.1090/s0002-9947-1977-0499028-7 fatcat:pgx6eehsp5hvlchvxng7ve7u4i