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Aug 18, 2017 at 21:18 vote accept Nikolayevich
Apr 3, 2017 at 20:29 history closed coudy
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Frieder Ladisch
Pietro Majer
Stefan Kohl
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Apr 3, 2017 at 20:21 answer added Igor Rivin timeline score: 2
Apr 3, 2017 at 19:40 comment added Liviu Nicolaescu Answer first the easier problem: how may psd square roots does the identity matrix have?
Apr 3, 2017 at 19:34 review Close votes
Apr 3, 2017 at 20:29
Apr 3, 2017 at 19:30 comment added YCor PSD = positive semi-definite, for those like me who need to google to decipher the abbreviations (possibly standard in English-speaking education, not mine)
Apr 3, 2017 at 19:23 comment added Federico Poloni Are you assuming that $A$ is PSD? Otherwise you can't find a PSD square root. If so, then yes, there is a unique PSD square root.
Apr 3, 2017 at 19:04 history asked Nikolayevich CC BY-SA 3.0