The Tame-Wild Dichotomy for coalgebras

Let KK be an algebraically closed field and let CC be a KK-coalgebra. The coalgebra CC is of tame comodule type if its finite-dimensional indecomposable comodules are parametrised by finitely many one-parameter families in each dimension, and is of wild comodule type if its comodule category contains, via an exact representation embedding, the category of finite-dimensional representations of Kx,yK\langle x,y\rangle. Tame-Wild Dichotomy. Every KK-coalgebra is either of tame comodule type or of wild comodule type, and these types are mutually exclusive. A weak version is known: over an algebraically closed field, tame comodule type implies not wild comodule type. The full dichotomy remains open.

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Primary source

Pascual Jara, Luis M. Merino and Gabriel Navarro, “Localization in tame and wild coalgebras”, arXiv:math/0701340 (2007).

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