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- W2001671553 abstract "In this paper we deal with the parallel approximability of a special class of quadratic programming (QP), called smooth quadratic programming. This subclass of QP is obtained by imposing restrictions on the coefficients of QP instance, namely the smoothness and positiveness restrictions. The smoothness condition restricts the magnitudes of the coefficients of the instance while the positiveness condition requires that (part of) the coefficients of the instance be non-negative. Interestingly, even with these restrictions several combinatorial optimization problems are captured by this class. We show that there is a parallel additive approximation procedure to instances of smooth QP. The additive procedure translates into an NC approximation scheme (NCAS) when the optimal value of the instance is Ω (n 2 ) , where n is the number of variables of the instance. In particular, the procedure yields an NCAS for positive instances of smooth QP. The additive approximation procedure is obtained by reducing the instance of QP to an instance of positive linear programming, finding in NC an approximate fractional solution to the obtained program, and then rounding the fractional solution to an integer approximate solution for the original problem. Next, we extend the result to instances of bounded degree Smooth Integer Programming. Finally, we consider several combinatorial problems that are modeled by smooth QP (or smooth integer programs) and show that the techniques presented here can be used to obtain NC Approximation Schemes for “dense” instances of such problems." @default.
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- W2001671553 date "2001-05-01" @default.
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- W2001671553 title "On the parallel approximability of a subclass of quadratic programming" @default.
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- W2001671553 doi "https://doi.org/10.1016/s0304-3975(99)00337-0" @default.
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