The natural norm induced by the L_1-norm is called the maximum absolute column sum norm and is defined by left double bracketing bar A right double bracketing bar _1 = max_j sum_(i = 1)^n left bracketing bar a_(i j) right bracketing bar for a matrix A. This matrix norm is implemented as MatrixNorm[m, 1] in the Wolfram Language package MatrixManipulationˋ .
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