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On Orthogonal Projections on the Space of Consistent Pairwise Comparisons Matrices

Koczkodaj Waldemar W., Smarzewski Ryszard, Szybowski Jacek

Fundamenta Informaticae

2020

Vol. 172, nr 4

379--397

In this study, the orthogonalization process for different inner products is applied to pairwise comparisons. Properties of consistent approximations of a given inconsistent pairwise comparisons matrix are examined. A method of a derivation of a priority vector induced by a pairwise comparison matrix for a given inner product has been introduced. The mathematical elegance of orthogonalization and its universal use in most applied sciences has been the motivating factor for this study. However, the finding of this study that approximations depend on the inner product assumed, is of considerable importance.