doi:10.1080/10586458.2018.1428131engArtal Bartolo, EnriqueGuerville-Ballé, BenoîtViu-Sos, JuanFundamental Groups of Real Arrangements and Torsion in the Lower Central Series QuotientsART-2020-109950By using computer assistance, we prove that the fundamental group of the complement of a real complexified line arrangement is not determined by its intersection lattice, providing a counter-example for a problem of Falk and Randell. We also deduce that the torsion of the lower central series quotients is not combinatorially determined, which gives a negative answer to a question of Suciu.2020http://zaguan.unizar.es/record/8822610.1080/10586458.2018.1428131http://zaguan.unizar.es/record/88226oai:zaguan.unizar.es:88226info:eu-repo/grantAgreement/ES/MICINN/MTM2016-76868-C2-2-PEXPERIMENTAL MATHEMATICS 29, 1 (2020), 28-35All rights reservedhttp://www.europeana.eu/rights/rr-f/info:eu-repo/semantics/openAccess