“…1 Many of these problems have practical relevance to graphtheoretic problems encountered in mathematical psychology. Examples include, but are not necessarily limited to, (i) max-cut clustering and its relationship to minimization of the line index of balance for signed graphs (Aref, Mason, & Wilson, 2018;Brusco & Steinley, 2010;Cartwright & Harary, 1956;Harary, 1959), (ii) graph coloring and chromatic numbers (Brusco & Cradit, 2004;Doignon, Ducamp, & Falmagne, 1984;Koppen, 1987), (iii) linear ordering problems, which have relevance to maximum-likelihood paired comparison ranking (Baker & Hubert, 1977;Brusco, 2001, DeCani, 1969Remage & Thompson, 1966;Tritchler & Lockwood, 1991) and directed acyclic graphs (Davis-Stober, Doignon, Fiorini, Glineur, & Regenwetter, 2018;Schweickert & Han, 2016;Schweickert, Fisher, & Goldstein, 2010), and (iv) finding a minimum subset of points that assures a point of interest falls within the convex hull, which is relevant to the study of distribution-free random utility models (e.g., Davis-Stober et al, 2018).…”