for each criterion, inwhichaij indicates the strength of alternative
i relative to alternative j for that criterion. A PC-matrix with the property that aijaji = 1 for all i = j and
aii = 1 for all i is called a symmetrically reciprocal matrix (SR-matrix) [12]. (Note that this abbreviation
might clash with the strongly regular matrices of Butkoviˇc [5], but not in this paper.)