In chapter 7 of the book "Accuracy and Stability of Numerical Algorithms" by Higham there is an upper bound for the relative error of solution of linear system in terms of elementwise error. However, in the formula there is a term $|E|x|,$ which I cannot parse. Image of the theorem on the page 123 with this term. What does it mean?
2026-03-26 04:50:17.1774500617
Bound on elementwise condition number in Higham
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