an:06325221
Zbl 1296.03030
Inuiguchi, Masahiro
Calculations of graded ill-known sets
EN
Kybernetika 50, No. 2, 216-233 (2014).
00333598
2014
j
03E72 68T37
ill-known set; lower approximation; upper approximation
Summary: To represent a set whose members are known partially, the graded ill-known set is proposed. In this paper, we investigate calculations of function values of graded ill-known sets. Because a graded ill-known set is characterized by a possibility distribution in the power set, the calculations of function values of graded ill-known sets are based on the extension principle but generally complex. To reduce the complexity, lower and upper approximations of a given graded ill-known set are used at the expense of precision. We give a necessary and sufficient condition that lower and upper approximations of function values of graded ill-known sets are obtained as function values of lower and upper approximations of graded ill-known sets.