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The real structured singular value is hardly approximable

机译:实际的结构奇异值几乎不可近似

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This paper investigates the problem of approximating the real structured singular value (real μ). A negative result is provided which shows that the problem of checking if μ=0 is NP-hard. This result is much more negative than the known NP-hard result for the problem of checking if μ<1. One implication of our result is that μ is hardly approximable in the following sense: there does not exist an algorithm, polynomial in the size n of the μ problem, which can produce an upper bound μˉ for μ with the guarantee that μ⩽μˉ⩽K(n)μ for any K(n)>0 (even exponential functions of n), unless NP=P. A similar statement holds for the lower bound of μ. Our result strengthens a recent result by Toker, which demonstrates that obtaining a sublinear approximation for μ is NP-hard
机译:本文研究了逼近真实结​​构奇异值(真实μ)的问题。提供的否定结果表明,检查μ= 0是否存在NP-hard问题。对于检查μ<1的问题,该结果比已知的NP-hard结果负面得多。我们的结果的一个暗示是,在以下意义上,μ几乎不可近似:不存在一种算法,即μ问题大小为n的多项式,该算法可以为μ生成上限μ,并保证μ的上限。对于任何K(n)> 0(n的偶数个指数函数)的K(n)μ,除非NP = P。 μ的下界也有类似的说法。我们的结果加强了Toker的最新结果,该结果表明获得μ的亚线性近似是NP-hard

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