Consider the problem of determining the pivot sequence used by the Gaussian Elimination algorithm with Partial Pivoting (GEPP). Let N stand for the order of the input matrix and let &egr; be any positive constant. Assuming P ≠ NC, we prove that if GEPP were decidable in parallel time M1/2–&egr; then all the problems in P would be characterized by polynomial speedup. This strengthens the P-completeness result that holds of GEPP. We conjecture that our result is valid even with the exponent 1 replaced for 1/2, and provide supporting arguments based on our result. This latter improvement would demonstrate the optimality of the naive parallel algorithm for GEPP (modulo P ≠ NC).

How much can we speedup Gaussian elimination with pivoting? / Leoncini, Mauro. - STAMPA. - (1994), pp. 290-297. ((Intervento presentato al convegno Parallel Algorithms and Architectures tenutosi a Cape May, New Jersey, United States nel 27 - 29 giugno 1994.

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