PF-SAW - Pythagorean extension of SAW

1. 1. Cost complement; PFWA aggregate.

   $$j\in {\Omega }_c:{\hat{\alpha }}_{ij}=({\nu }_{ij},{\mu }_{ij});{\mathrm{PFWA}}_w({\alpha }_1,\dots ,{\alpha }_n)=((1-\prod _j(1-{\mu }_j^2{)}^{w_j}{)}^{1/2},\prod _j{\nu }_j^{w_j});{\tilde{Z}}_i={\mathrm{PFWA}}_w({\hat{\alpha }}_{i1},\dots ,{\hat{\alpha }}_{in})$$

2. 2. Score s_i = μ² - ν²; rank descending.

   $$s_i={\tilde{\mu }}_i^{Z2}-{\tilde{\nu }}_i^{Z2};\text{rank descending}$$