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Results tagged with linear-algebra
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user 500159
Questions about the properties of vector spaces and linear transformations, including linear systems in general.
3
votes
Factoring positive semidefinite matrices over $\mathbb{Q}[i]$
For the special case of $n=2$, I think I have a complete answer to Question': We get a factoring $P=AA^*$ with $A\in GL_2(\mathbb{Q}[i])$ iff $\det(P)$ is the sum of two rational squares.
For the proo …
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