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Publication Citation: Lower Bounds for Accessing Information on Pure Pointer Machines

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Author(s): Brian D. Cloteaux; Desh Ranjan;
Title: Lower Bounds for Accessing Information on Pure Pointer Machines
Published: July 13, 2009
Abstract: We study the complexity of representing an array on a Pure Pointer Machine (PPM) or a pointer machine without arithmetic capabilities. In particular, we show that lower bounds in access time for information retrieval on a PPM arise from two different factors: the amount of information being stored and the limited number of unique neighborhoods with a fixed radius that can be constructed on a PPM. This result contrasts with earlier work by Ben Amram and Galil which showed that for pointer machines with arithmetic capabilities, look-up time only depends on the amount of information stored. We then apply these bounds to show optimal look-up times for comparing elements in partial and total orders on a PPM.
Proceedings: Proceedings of the International Conference on Foundations of Computer Science
Pages: pp. 103 - 107
Location: Las Vegas, NV
Dates: July 13-16, 2009
Keywords: incompressibility;pointer machine;random access memory
Research Areas: Math
PDF version: PDF Document Click here to retrieve PDF version of paper (138KB)