Compact and weakly compact operators on function spaces are studied. Those operators are characterized by properties of finitely additive set functions whose existence is guaranteed by Riesz ...

A sufficient condition is given for the sum A + B of two linear m-accretive operators A and B in a Hilbert space to be m-accretive. This condition is expressed in terms of Re (Au, Bu) for u in D, ...

Fuzzy normed linear spaces extend conventional normed spaces by integrating a degree of imprecision through fuzzy set theory, thereby quantifying uncertainty in the measurement of vector magnitude. In ...