Fabian Frank

2 accepted papers

2026

Reconfiguring Proportional Committees

Chris Dong, Fabian Frank, Jannik Peters, Warut Suksompong

AAAI 2026technical

An important desideratum in approval-based multiwinner voting is proportionality. We study the problem of reconfiguring proportional committees: given two proportional committees, is there a transition path that consists only of proportional committees, where each transition involves replacing one c

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2026

Stability Under Valuation Updates in Coalition Formation

Fabian Frank, Matija Novaković, Rene Romen

IJCAI 2026

Coalition formation studies how to partition a set of agents into disjoint coalitions based on their preferences. In this paper, we consider the class of additively separable hedonic games and study the setting in which agents' valuations of each other evolve over time. Since rearranging coalitions

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