  In this paper, we discuss quasidense multifunctions from a Banach space into
its dual, and use the two sum theorems proved in a previous paper to give
various characterizations of quasidensity. We investigate the Fitzpatrick
extension of such a multifunction. We prove that, for closed monotone
multifunctions, quasidensity implies type (FPV) and strong maximality, and that
quasidensity is equivalent to type (FP). This version differs from Version 3 in
that a few minor errors have been corrected.

Functional Analysis