Tag: eigenvalues
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Wrangling quartics, V
Yesterday I went to discuss the problem with one of my colleagues. He had the interesting idea of modelling $S$, and especially $S^2$, as low rank, in particular as $S = s_1 e_1 e_1^T$. That is, shifting the focus on $S$ from $Z$. I tried this out today, and although it didn’t quite pan out,…