Wild problem
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A mathematical problem is wild if it contains the problem of classifying pairs of square matrices up to simultaneous similarity.[1] Examples of wild problems are classifying indecomposable representations of any quiver that is neither a Dynkin quiver (i.e. the underlying undirected graph of the quiver is a (finite) Dynkin diagram) nor a Euclidean quiver (i.e. the underlying undirected graph of the quiver is an Affine Dynkin diagram ).
References
- ^ Genrich R. Belitskii, Vladimir V. Sergeichuk, Complexity of matrix problems http://arxiv.org/abs/0709.2488