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Non-commutative rings and algebras, non-associative algebras. Can be used in combination with ra.rings-and-algebras

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Geometry of numbers for three by three matrices?

The volume of $S_1$ is $\frac{16767 \pi^4}{560} \approx 2916.53$. The idea is to realize that the set $S_1$ can be equivalently described as the nuclear norm (sum of the singular values $\sigma_i$) o …
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