Abstract
We identify a class of Linear Complementarity Problems (LCPs) that are solvable in strongly polynomial time by Lemke’s Algorithm (Scheme 1) or by the Parametric Principal Pivoting Method (PPPM). This algorithmic feature for the class of problems under consideration here is attributable to the proper selection of the covering vector in Scheme 1 or the parametric direction vector in the PPPM which leads to solutions of limited and monotonically increasing support size; such solutions are sparse. These and other LCPs may very well have multiple solutions, many of which are unattainable by either algorithm and thus are said to be elusive. The initial conditions imposed on the new matrix class identified in Sect. 2 are subsequently relaxed in later sections.
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The authors are grateful to two referees who have made some constructive comments that have helped to improve the presentation of the paper.
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J.-S. Pang: The work of this author is based on research supported by the National Science Foundation under grants CMMI 1402052 and 0969600.
Part of this work was done while the authors were visiting the Institute for Mathematical Sciences at the National University of Singapore.
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Adler, I., Cottle, R.W. & Pang, JS. Some LCPs solvable in strongly polynomial time with Lemke’s algorithm. Math. Program. 160, 477–493 (2016). https://doi.org/10.1007/s10107-016-0996-4
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DOI: https://doi.org/10.1007/s10107-016-0996-4