Computing the norm ∥A∥∞,1 is NP-hard

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How researchers see this paper

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Matrix Mathematics: Theory, Facts, and Formulas with Application to Linear Systems Theory (2005, unknown): “See [490] and [280, p.”
On the Complexity of Robust PCA and ℓ1-norm Low-Rank Matrix Approximation (2015, unknown): “We partition the solution (u, v) into k blocks (Kup ,K v p ) for 1 ≤ p ≤ k such that for all i ∈ Kup and j ∈ Kvp ui = ±αp and vj = ± 1 αp .”
Linear Optimization Problems with Inexact Data (2006, background): “One might hope to find an essentially better formula for ‖A‖∞,1, but such an attempt is not likely to succeed due to the following complexity result proved again in [165].”
Forty necessary and sufficient conditions for regularity of interval matrices: A survey (2009, background): “And fourth, it implies that an interval matrix of the form [Ac − pqT ,A c + pqT ], where p, q are nonnegative column vectors in Rn, is regular if and only if TqA−1 c Tp ∞,1 22 ] for the norm · ∞,1).”