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Delooping levels

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arxiv 2410.16422 v1 pith:ZPDFZHR7 submitted 2024-10-21 math.RT

classification math.RT
keywords delldeloopingdimensionalgebrafinitistichomologicalinvariantlevel
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abstract

In [8] V. G\'elinas introduced a homological invariant, called {\it delooping level} (dell), that bounds the finitistic dimension. In this article, we introduce another homological invariant (Dell) related to the delooping level for an Artin algebra. We compare this new tool with other dimensions as the finitistic dimension or the $\phi$-dimension (where $\phi$ is the first Igusa-Todorov function), and we also generalize Theorem 4.3. from [9] to truncated path algebras (Theorem 4.18). Finally, we show that for a monomial algebra $A$ the difference dell($A$) - Findim($A$) can be arbitrarily large (Example 4.22).

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  1. Homological Invariants of Left and Right Serial Path Algebras

    math.RT 2025-06 conditional novelty 6.0 of 10

    In right serial path algebras the left delooping level equals the right finitistic dimension; left serial algebras need an extra condition, with a counterexample where the derived delooping level does better.

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