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Unit forms occur in the representation theory of algebras, partially ordered sets and related areas. They appear as Tits forms and Euler forms. Their weak positivity resp. non-negativity frequently characterizes finite and tame representation types. Their positive roots correspond to indeeomposable representations. Let e ¢n~ be the vector in 7/n with(More)
The Auslander-Reiten quiver of a finite-dimensional associative algebra A encodes information about the indecomposable finite-dimensional representations of A and their homomorphisms. A component of the Auslander-Reiten quiver is called preprojective if it does not admit oriented cycles and each of its modules can be shifted into a projective module using(More)
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