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arXiv 1209.3987math.RAmath.COmath.RT
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通用几何簇代数

Universal geometric cluster algebras

Nathan Reading

AI总结:

本文研究了基于交换矩阵B的几何簇代数及其系数特化,探讨了通用几何系数的构造,通过突变风扇F_B与g向量的关系,讨论了有限类型和仿射类型的构造方法。

摘要:

我们考虑每个交换矩阵B对应的几何簇代数类别及其在簇代数间的系数特化。该类别也依赖于底层环R,通常为整数、有理数或实数。我们略微扩展了几何簇代数的定义,并相应调整了系数特化的定义。如果更广泛的类别具有通用对象,则称为B上的簇代数或通用几何簇代数。构造通用系数等同于找到B的R基(一种突变线性概念的基)。通过突变风扇F_B,多面体几何在构造通用几何系数中起关键作用,我们怀疑F_B在构造通用几何系数之外还可能是一个重要对象。我们建立了F_B与g向量之间的联系,并在秩2和有限类型中构造了通用几何系数,讨论了仿射类型的构造方法。

英文摘要:

We consider, for each exchange matrix B, a category of geometric cluster algebras over B and coefficient specializations between the cluster algebras. The category also depends on an underlying ring R, usually the integers, rationals, or reals. We broaden the definition of geometric cluster algebras slightly over the usual definition and adjust the definition of coefficient specializations accordingly. If the broader category admits a universal object, the universal object is called the cluster algebra over B with universal geometric coefficients, or the universal geometric cluster algebra over B. Constructing universal coefficients is equivalent to finding an R-basis for B (a "mutation-linear" analog of the usual linear-algebraic notion of a basis). Polyhedral geometry plays a key role, through the mutation fan F_B, which we suspect to be an important object beyond its role in constructing universal geometric coefficients. We make the connection between F_B and g-vectors. We construct universal geometric coefficients in rank 2 and in finite type and discuss the construction in affine type.

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