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The Semilinear Home-Space Problem Is Ackermann-Complete for Petri Nets Jančar, Petr Leroux, Jérôme Petri nets home-space property semilinear sets Ackermannian complexity A set of configurations H is a home-space for a set of configurations X of a Petri net if every configuration reachable from (any configuration in) X can reach (some configuration in) H. The semilinear home-space problem for Petri nets asks, given a Petri net and semilinear sets of configurations X, H, if H is a home-space for X. In 1989, David de Frutos Escrig and Colette Johnen proved that the problem is decidable when X is a singleton and H is a finite union of linear sets with the same periods. In this paper, we show that the general (semilinear) problem is decidable. This result is obtained by proving a duality between the reachability problem and the non-home-space problem. In particular, we prove that for any Petri net and any linear set of configurations L we can effectively compute a semilinear set C of configurations, called a non-reachability core for L, such that for every set X the set L is not a home-space for X if, and only if, C is reachable from X. We show that the established relation to the reachability problem yields the Ackermann-completeness of the (semilinear) home-space problem. For this we also show that, given a Petri net with an initial marking, the set of minimal reachable markings can be constructed in Ackermannian time. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Petr Jančar and Jérôme Leroux 2023 Is Part Of LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.CONCUR.2023.36 urn:nbn:de:0030-drops-190300 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.36 eng https://creativecommons.org/licenses/by/4.0/legalcode