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RepoToronto

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2011-7-11 
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发表于 2011-7-11 19:50 | 显示全部帖子
yes, understood. Choice a has a sign change as does choice b. Which is better?

A: -1, 1, -0.9
B: -1.8, 10, -9

How is one to know that A will not give multiple solutions where B will?

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