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Title: On a question of nearly minimal identification of functions
Authors: Jain, S. 
Issue Date: 1999
Citation: Jain, S. (1999). On a question of nearly minimal identification of functions. Information Processing Letters 70 (3) : 113-117. ScholarBank@NUS Repository.
Abstract: Suppose A and B are classes of recursive functions. A is said to be an m-cover (*-cover) for B, iff for each g∈B, there exists an f∈A such that f differs from g on at most m inputs (finitely many inputs). C, a class of recursive functions, is a-immune iff C is infinite and every recursively enumerable subclass of C has a finite a-cover. C is a-isolated iff C is finite or a-immune. Chen (1981) conjectured that every class of recursive functions that is MEx* m-identifiable is *-isolated. We refute this conjecture.
Source Title: Information Processing Letters
ISSN: 00200190
DOI: 10.1016/S0020-0190(99)00051-4
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