2010/09/30 by M. A. Cerdà-Uguet, Cerdà-Uguet, M. A., Michel Schellekens +5
Computer Science · Mathematics · #47H10 #54E50 #54F05 #68Q25 #68W40 #Advanced Topology and Set Theory #Computational Complexity (cs.CC) #D.2.8 #F.1.3 #F.2.0 #FOS: Computer and information sciences #Fixed Point Theorems Analysis #G.2.1 #Mathematical Dynamics and Fractals #acm:47H10 #acm:54E50 #acm:54F05 #acm:68Q25 #acm:68W40 #cs.CC #msc:47H10 #msc:54E50 #msc:54F05 #msc:68Q25 #msc:68W40
paper · pdf · doi:10.48550/arxiv.1009.6105
25 pages
arxiv created 2010/09/30 · openalex publication_date 2010/09/30 · arxiv updated 2010/10/01 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
In 1994, S.G. Matthews introduced the notion of partial metric space in order to obtain a suitable mathematical tool for program verification [Ann. New York Acad. Sci. 728 (1994), 183-197]. He gave an application of this new structure to parallel computing by means of a partial metric version of the celebrated Banach fixed point theorem [Theoret. Comput. Sci. 151 (1995), 195-205]. Later on, M.P. Schellekens introduced the theory of complexity (quasi-metric) spaces as a part of the development of a topological foundation for the asymptotic complexity analysis of programs and algorithms [Elec- tronic Notes in Theoret. Comput. Sci. 1 (1995), 211-232]. The applicability of this theory to the asymptotic complexity analysis of Divide and Conquer algorithms was also illustrated by Schellekens. In particular, he gave a new proof, based on the use of the aforenamed Banach fixed point theorem, of the well-known fact that Mergesort al- gorithm has optimal asymptotic average running time of computing. In this paper, motivated by the utility of partial metrics in Computer Science, we discuss whether the Matthews fixed point theorem is a suitable tool to analyze the asymptotic complexity of algorithms in the spirit of Schellekens. Specifically, we show that a slight modification of the well-known Baire partial metric on the set of all words over an alphabet constitutes an appropriate tool to carry out the asymptotic complexity analysis of algorithms via fixed point methods without the need for assuming the convergence condition inherent to the defini- tion of the complexity space in the Shellekens framework. Finally, in order to illustrate and to validate the developed theory we apply our results to analyze the asymptotic complexity of Quicksort, Mergesort and Largesort algorithms.