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In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra, studied by Ringel (1990). It has a basis of equivalence classes of objects of an abelian category, and the structure constants for this basis are related to the numbers of extensions of objects in the category.

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  • In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra, studied by Ringel (1990). It has a basis of equivalence classes of objects of an abelian category, and the structure constants for this basis are related to the numbers of extensions of objects in the category.
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  • Ringel–Hall algebra
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  • In mathematics, a Ringel–Hall algebra is a generalization of the Hall algebra, studied by Ringel (1990). It has a basis of equivalence classes of objects of an abelian category, and the structure constants for this basis are related to the numbers of extensions of objects in the category.
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