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Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	where Clearly, if is a solution to (12) then is an optimal solution to the problem described by (1).We give some properties of the function in the following lemma, which will be used in the sequel.
http://www.w3.org/ns/prov#wasQuotedFrom	hindawi.com