At which point is a condition # considered ill-conditioned? In my opinion, a condition # of $10^{10}$ corresponds to ill-conditioning obviously.
But what about a condition # of say, $2000$? $200$? $20$?
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How high is up? – Robert Israel Dec 13 '17 at 22:14
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I saw a rule of thumb on wikipedia, but it required you to decide how many significant digits is acceptable. – Emil Jul 13 '18 at 20:38