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arXiv 1607.08404math.NAcs.NAmath.AGmath.OC
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求积法的优化:直线上的高斯求积与平面代数曲线及高维空间中少数节点的求积的新特性

Optimization approaches to quadrature: new characterizations of Gaussian quadrature on the line and quadrature with few nodes on plane algebraic curves, on the plane and in higher dimensions

University of Tromsø(特罗姆瑟大学);Universität Konstanz(康斯坦茨大学)

Cordian Riener, Markus Schweighofer

AI总结:

本文研究了在平面代数曲线及高维空间中,利用少数节点进行求积的新方法,提出在有限条件下,存在精确度达2d-1次的求积规则,并展示了如何通过优化正定形式的值来构造高斯求积规则。

摘要:

本文研究了在平面代数曲线及高维空间中,利用少数节点进行求积的新方法,提出在有限条件下,存在精确度达2d-1次的求积规则,并展示了如何通过优化正定形式的值来构造高斯求积规则。

英文摘要:

Let $d$ and $k$ be positive integers. Let $μ$ be a positive Borel measure on $\mathbb{R}^2$ possessing finite moments up to degree $2d-1$. If the support of $μ$ is contained in an algebraic curve of degree $k$, then we show that there exists a quadrature rule for $μ$ with at most $dk$ many nodes all placed on the curve (and positive weights) that is exact on all polynomials of degree at most $2d-1$. This generalizes both Gauss and (the odd degree case of) Szegő quadrature where the curve is a line and a circle, respectively, to arbitrary plane algebraic curves. We use this result to show that, without any hypothesis on the support of $μ$, there is always a cubature rule for $μ$ with at most $\frac32d(d-1)+1$ many nodes. In both results, we show that the quadrature or cubature rule can be chosen such that its value on a certain positive definite form of degree $2d$ is minimized. We characterize the unique Gaussian quadrature rule on the line as the one that minimizes this value or several other values as for example the sum of the nodes' distances to the origin. The tools we develop should prove useful for obtaining similar results in higher-dimensional cases although at the present stage we can present only partial results in that direction.

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