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Because of the superiority in dealing with uncertainty expression, Dempster‐Shafer theory (D‐S theory) is widely used in decision theory. In D‐S theory, the basic probability assignment (BPA) is the basis and core. Recently, some researchers represent BPA on a ‐dimension frame of discernment (FOD) as ‐dimension vector in Descartes coordinate system. This representation treats a BPA as a point...