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May
15
revised Does a quadratic necessarily have a root in this interval?
deleted 35 characters in body
Mar
9
revised Proof involving matrix inverse of: $\|A^{-1}\|_\infty \ge \frac{\|U^{-1}\|_\infty}{n}$
deleted 266 characters in body
Mar
9
revised Proof involving matrix inverse of: $\|A^{-1}\|_\infty \ge \frac{\|U^{-1}\|_\infty}{n}$
added 61 characters in body