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Matrix P-norms are NP-hard to approximate if p neq 1,2,infty

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arxiv 0908.1397 v3 pith:U5FXYLSM submitted 2009-08-10 cs.CC

Matrix P-norms are NP-hard to approximate if p neq 1,2,infty

classification cs.CC
keywords inftyalgorithmmatrixpolynomial-timeprecisionrationalrelativethere
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We show that for any rational p \in [1,\infty) except p = 1, 2, unless P = NP, there is no polynomial-time algorithm for approximating the matrix p-norm to arbitrary relative precision. We also show that for any rational p\in [1,\infty) including p = 1, 2, unless P = NP, there is no polynomial-time algorithm approximates the \infty, p mixed norm to some fixed relative precision.

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