[...] each pair of segments is DISTINCT in the sense that for any pair of different segments there is at least one feature f such that one member of the pair is specified +f and the other -f. - Stanley (2004), a pag.58 [...] given (two completely or incompletely specified) matrices M and N WHICH HAVE THE SAME NUMBER OF COLUMNS, then: [...] (2) M is DISTINCT from N (equivalently, N is distinct from M) if for some specification in M, N has the opposite specification in the corresponding position. - Stanley (2004), a pag.64
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