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arXiv 2207.09359math.CO
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环与子多边形上的Grassmannian

Grassmannians over rings and subpolygons

Michael Cuntz

摘要:

我们调查特殊点的格拉斯曼对应的friezes系数的情况下,秩二。利用算术拟阵的表示,我们得到了一个定理的子多边形的坐标环的专门化。作为一个特殊的情况下,我们恢复在经典的中楣图案的子多边形的特征。此外,我们观察到,专门集群的坐标环的格拉斯曼单位产生的表示,可以被解释为安排的超平面显着的属性。特别地,我们得到了某些外尔群和群胚作为广义frieze模式的解释。

英文摘要:

We investigate special points on the Grassmannian which correspond to friezes with coefficients in the case of rank two. Using representations of arithmetic matroids we obtain a theorem on subpolygons of specializations of the coordinate ring. As a special case we recover the characterization of subpolygons in classic frieze patterns. Moreover, we observe that specializing clusters of the coordinate ring of the Grassmannian to units yields representations that may be interpreted as arrangements of hyperplanes with notable properties. In particular, we get an interpretation of certain Weyl groups and groupoids as generalized frieze patterns.

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