Diner, Ö.Y.Giannopoulou, A.C.Stamoulis, G.Thilikos, D.M.2023-10-192023-10-192021197830308683760302-9743https://doi.org/10.1007/978-3-030-86838-3_3https://hdl.handle.net/20.500.12469/475747th International Workshop on Graph-Theoretic Concepts in Computer Science, WG 2021 --23 June 2021 through 25 June 2021 -- --265739We introduce the parameter of block elimination distance as a measure of how close a graph is to some particular graph class. Formally, given a graph class G, the class B(G) contains all graphs whose blocks belong to G and the class A(G) contains all graphs where the removal of a vertex creates a graph in G. Given a hereditary graph class G, we recursively define G( k ) so that G(0 )= B(G) and, if k? 1, G( k )= B(A(G( k - 1 )) ). The block elimination distance of a graph G to a graph class G is the minimum k such that G? G( k ) and can be seen as an analog of the elimination distance parameter, defined in [J. Bulian & A. Dawar. Algorithmica, 75(2):363–382, 2016], with the difference that connectivity is now replaced by biconnectivity. We show that, for every non-trivial hereditary class G, the problem of deciding whether G? G( k ) is NP-complete. We focus on the case where G is minor-closed and we study the minor obstruction set of G( k ) i.e., the minor-minimal graphs not in G( k ). We prove that the size of the obstructions of G( k ) is upper bounded by some explicit function of k and the maximum size of a minor obstruction of G. This implies that the problem of deciding whether G? G( k ) is constructively fixed parameter tractable, when parameterized by k. Our results are based on a structural characterization of the obstructions of B(G), relatively to the obstructions of G. Finally, we give two graph operations that generate members of G( k ) from members of G( k - 1 ) and we prove that this set of operations is complete for the class O of outerplanar graphs. This yields the identification of all members O? G( k ), for every k? N and every non-trivial minor-closed graph class G. © 2021, Springer Nature Switzerland AG.eninfo:eu-repo/semantics/openAccessBiconnected graphsElimination distanceGraph minorsObstructionsParameterized algorithmsGraph theoryParameter estimationBiconnected graphClass AClass BClass GElimination distanceGraph classGraph minorsNon-trivialObstructionParameterized algorithmGraphic methodsConference Object283812911 LNCS10.1007/978-3-030-86838-3_32-s2.0-85115834535Q2