Marcin Borkowski**Another look at hyperconvex hulls**

The talk will be devoted to a certain generalization of the notion of

a metric space, inspired by applications to taxonomy, in which one can

introsuce an analogue of the notion of hyperconvexity. We will start

with an a bit atypical angle on Isbell's hyperconvex hull, and then we

will proceed to describe some problems with transferring his ideas to

the generalization in question.