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arXiv math/0505315math.ACmath.RA
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类属行列式上的伴随模和极大Cohen-Macaulay模的因式分解

Factoring the Adjoint and Maximal Cohen--Macaulay Modules over the Generic Determinant

Ragnar-Olaf Buchweitz, Graham J. Leuschke

摘要:

伯格曼的一个问题是,域上一般方阵的伴随是否可以非平凡地分解为方阵的乘积。我们证明了当矩阵为偶数时,这种分解确实存在于任何系数环上。建立这样的因式分解和扩展的最大科恩-麦考利模块的通用行列式之间的对应关系,我们展示了所有的因式分解,其中一个因素的行列式等于通用行列式。分类表明,不仅科恩-麦考利表示论的一般行列式是野生的驯服野生二分法,但它是相当野生的:即使在秩2,同构类不能参数化的有限维多样性的系数。我们进一步的因式分解问题的乘法结构的$\Ext$ -代数的两个非平凡秩1极大的科恩-麦考利模块,并确定它完全。

英文摘要:

A question of Bergman asks whether the adjoint of the generic square matrix over a field can be factored nontrivially as a product of square matrices. We show that such factorizations indeed exist over any coefficient ring when the matrix has even size. Establishing a correspondence between such factorizations and extensions of maximal Cohen--Macaulay modules over the generic determinant, we exhibit all factorizations where one of the factors has determinant equal to the generic determinant. The classification shows not only that the Cohen--Macaulay representation theory of the generic determinant is wild in the tame-wild dichotomy, but that it is quite wild: even in rank two, the isomorphism classes cannot be parametrized by a finite-dimensional variety over the coefficients. We further relate the factorization problem to the multiplicative structure of the $\Ext$--algebra of the two nontrivial rank-one maximal Cohen--Macaulay modules and determine it completely.

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