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Classification of various mathematical structures. For classification in the sense of statistics / machine learning, use [tag:statistical-classification].

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Basics of classification of trilinear forms (when is it non-discrete)

What is known about the classification? (Complete) invariants? Unlike the case of bi-linear forms, in general the classification has moduli. … My particular question: for which triples $(n_1,n_2,n_3)$ is the classification discrete? (The obvious necessary condition, $n_1n_2n_3\le n^2_1+n^2_1+n^2_3$, is certainly not sufficient.) …
Dmitry Kerner's user avatar