We consider the problem of finding a "fair" or "acceptable" spanning tree in an undirected graph when each member of a group of agents proposes a spanning tree. An "acceptable" spanning tree in that respect is a spanning tree which does not differ in more than a given number of edges from each...

This paper establishes the computational complexity status for a problem of deciding on the quality of a committee. Starting with individual preferences over alternatives, we analyse when it can be determined efficiently if a given committee C satisfies a weak (resp. strong) Condorcet...

In several situations agents need to be assigned to activities on basis of their preferences, and each agent can take part in at most one activity. Often, the preferences of the agents do not depend only on the activity itself but also on the number of participants in the respective activity. In...

The computational complexity status for a problem of deciding on the quality of a committee is established. Starting with individual preferences over alternatives, we analyze when it can be determined efficiently if a given committee C satisfies a weak Condorcet criterion - i.e., if C is at...