This paper considers a particular case of the Optimal Homologous Chain Problem (OHCP) for integer modulo 2 coefficients, where optimality is meant as a minimal lexicographic order on chains induced by a total order on simplices. The matrix reduction algorithm used for persistent homology is used to derive polynomial algorithms solving this problem instance, whereas OHCP is NP-hard in the general case. The complexity is further improved to a quasilinear algorithm by leveraging a dual graph minimum cut formulation when the simplicial complex is a pseudomanifold. We then show how this particular instance of the problem is relevant, by providing an application in the context of point cloud triangulation.
@InProceedings{cohensteiner_et_al:LIPIcs.SoCG.2020.32, author = {Cohen-Steiner, David and Lieutier, Andr\'{e} and Vuillamy, Julien}, title = {{Lexicographic Optimal Homologous Chains and Applications to Point Cloud Triangulations}}, booktitle = {36th International Symposium on Computational Geometry (SoCG 2020)}, pages = {32:1--32:17}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-143-6}, ISSN = {1868-8969}, year = {2020}, volume = {164}, editor = {Cabello, Sergio and Chen, Danny Z.}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.SoCG.2020.32}, URN = {urn:nbn:de:0030-drops-121908}, doi = {10.4230/LIPIcs.SoCG.2020.32}, annote = {Keywords: OHCP, simplicial homology, triangulation, Delaunay} }
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