Let N denote the set of positive integers. The asymptotic density of the set A ⊆ N is d(A) = limn→∞ |A ∩ [1, n]|/n, if this limit exists. Let AD denote the set of all sets of positive integers that have asymptotic density, and let SN denote the set of all permutations of the positive integers N. The group L consists of all permutations f ∈ SN such that A ∈ AD if and only if f(A) ∈ AD, and the g...

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In this note, we introduce DataSpace Archives. DataSpace Archives are built on top of DataSpace’s DSTP servers [2] and are designed not only to provide a long term archiving of data, but also to enable the archived data to be discovered, explored, integrated and mined. DataSpace Archives are based upon web services. Web services’ UDDI and WSDL mechanisms provide a simple means for any web servi...