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In this paper the definitions of class of α-upper (resp. α-lower) fuzzy sets andweak extension principle and α-upper (resp. α-lower) fuzzy set category are givenand rationality of weak extension priuciple is illustrated. By the way we popularizeTheorem 2.3 in [1]. Let L be a complete lattice, 0 and 1 respectively the least and the greatestelement of L. 相似文献
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