Representations of monomial algebras have poly-exponential complexities

Details Representations of monomial algebras have poly-exponential complexities Representations of monomial algebras have poly-exponential complexities

2010-11-16

arxiv.org/abs/1011.3554v2

Mathematics

Representation Theory

Scientific paper

We use directed graphs called "syzygy quivers" to study the asymptotic growth rates of the dimensions of the syzygies of representations of finite dimensional algebras. For any finitely generated representation of a monomial algebra, we show that this growth rate is poly-exponential, i.e. the product of a polynomial and an exponential function, and give a procedure for computing the corresponding degree and base from a syzygy quiver. We characterize the growth rates arising in this context: The bases of the occurring exponential functions are the real, nonnegative algebraic integers $b$ whose irreducible polynomial over $\mathbb{Q}$ has no root with with modulus larger than $b$. Moreover, we show that these growth rates are invariant under stable derived equivalences.

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