This paper generalises Pawlak's rough approach to Reduction of Decision Rules using Decision Logic language (DL-language) by introducing Approximate Decision Logic language (ADL-language) based on almost indiscernibility relation. An information system has been considered where attribute values are not always quantitative, rather subjective having vague or imprecise meanings. Some objects may have attribute values which are almost identical. This observation has been analysed here based on fuzzy proximity relations on different domains of attributes.
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