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1. CMB 2013 (vol 57 pp. 225)

 Small Flag Complexes with Torsion We classify flag complexes on at most $12$ vertices with torsion in the first homology group. The result is moderately computer-aided. As a consequence we confirm a folklore conjecture that the smallest poset whose order complex is homotopy equivalent to the real projective plane (and also the smallest poset with torsion in the first homology group) has exactly $13$ elements. Keywords:clique complex, order complex, homology, torsion, minimal modelCategories:55U10, 06A11, 55P40, 55-04, 05-04