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arXiv 2211.03315math.AC
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张量积的Hilbert-Kunz密度函数与Fourier变换

Hilbert-Kunz Density function of tensor product and Fourier transformation

Mandira Mondal

摘要:

对于特征$p>0$的理想域上的维数为$\geq 2$的标准分次环$R$和有限长度的齐次理想$I$,$R$关于$I$的HK密度函数是紧支撑连续函数$f_{R, I}:[0, \infty)\longto [0, \infty)$,其积分产生\mbox{HK}重数$e_{HK}(R, I)$ .本文回答了V. Trivedi关于标准分次环张量积的Hilbert-Kunz密度函数的一个问题,证明了它是因子环的Hilbert-Kunz密度函数的卷积.利用Fourier变换,作为推论,得到了环的张量积的\mbox{HK}重数是因子环的HK重数的乘积。我们计算投影曲线的\mbox{HK}密度函数的傅里叶变换。

英文摘要:

For a standard graded ring $R$ of dimension $\geq 2$ over a perfect field of characteristic $p>0$ and a homogeneous ideal $I$ of finite colength, the HK density function of $R$ with respect to $I$ is a compactly supported continuous function $f_{R, I}:[0, \infty)\longto [0, \infty)$, whose integration yields the \mbox{HK} multiplicity $e_{HK}(R, I)$. Here we answer a question of V. Trivedi about the Hilbert-Kunz density function of the tensor product of standard graded rings and show that it is the convolution of the Hilbert-Kunz density function of the factor rings. Using Fourier transform, as a corollary we get \mbox{HK} multiplicity of the tensor product of rings is product of the HK multiplicity of the factor rings. We compute the Fourier transform of the \mbox{HK} density function of a projective curve.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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