Pairwise Comparisons Matrix Decomposition into Approximation and Orthogonal Component Using Lie Theory
arXiv:2101.05271
Abstract
This paper examines the use of Lie group and Lie Algebra theory to construct the geometry of pairwise comparisons matrices. The Hadamard product (also known as coordinatewise, coordinate-wise, elementwise, or element-wise product) is analyzed in the context of inconsistency and inaccuracy by the decomposition method. The two designed components are the approximation and orthogonal components. The decomposition constitutes the theoretical foundation for the multiplicative pairwise comparisons. Keywords: approximate reasoning, subjectivity, inconsistency, consistency-driven, pairwise comparison, matrix Lie group, Lie algebra, approximation, orthogonality, decomposition.
arXiv comment17 pages, 2 figures; Lie theory knowledge is needed; the decomposition of a PC matrix into an approximation component and orthogonal component (interpreted as the approximation error) was obtained. Without such decomposition, the pairwise comparisons method has remained incomplete for 722 years from its first scholarly presentation
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