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arXiv 2109.03441math.RTmath.CO
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拟遗传Nakayama代数的一个新刻画及其应用

A new characterisation of quasi-hereditary Nakayama algebras and applications

René Marczinzik, Emre Sen

摘要:

我们称有限维代数A为S-连通的,如果简单A-模的投射维数形成一个区间.证明了Nakayama代数A是S-连通的当且仅当A是拟遗传的。我们应用这个结果改进了Brown关于拟遗传Nakayama代数的整体维数的一个不等式。我们进一步分类的Nakayama代数,其中达到相等的布朗不等式,并表明,他们列举的偶数指标的斐波那契数,如果代数是循环的和奇数指标的斐波那契数,如果代数是线性的。

英文摘要:

We call a finite dimensional algebra A S-connected if the projective dimensions of the simple A-modules form an interval. We prove that a Nakayama algebra A is S-connected if and only if A is quasi-hereditary. We apply this result to improve an inequality for the global dimension of quasi-hereditary Nakayama algebras due to Brown. We furthermore classify the Nakayama algebras where equality is attained in Brown's inequality and show that they are enumerated by the even indexed Fibonacci numbers if the algebra is cyclic and by the odd indexed Fibonacci numbers if the algebra is linear.

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