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    Hello, I understand the 1 norm of a real matrix is the maximum absolute column sum, but if it is a complex matrix how can you find the 1 norm?
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    This is the question i'm struggling with, asking for the 1 norm condition number of a matrix A. Which if i'm correct is found by

    kappa = (1 norm of A) x (1 norm of A_inverse)

    But A is a complex matrix, hence the confusion as surely the imaginary numbers will never cancel?

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