Roughness in subtraction algebras |
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Commun. Korean Math. Soc. 2006 Vol. 21, No. 4, 653-664 Printed December 1, 2006 |
Sun Shin Ahn, Young Bae Jun, Kyoung Ja Lee Dongguk University, Gyeongsang National University, Kookmin University |
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Abstract : As a generalization of ideals in subtraction algebras, the notion of rough ideals is discussed. |
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Keywords : lower/upper approximation, definable subset, lower/up-per rough subalgebra/ideal |
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MSC numbers : 03G25, 06B10, 06D99 |
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