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arXiv 1106.1003math.COmath-phmath.CAmath.CVmath.MPmath.NT
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偏θ函数的首根

The leading root of the partial theta function

Alan D. Sokal

摘要:

我研究了部分θ函数Θ_0(x,y)= \sum_{n=0}^\ infty x^n y^{n(n-1)/2}的主根x_0(y),将其视为形式的幂级数。证明了-x_0(y)的所有系数都是严格正的。实际上,我证明了更强的结果:常数项1之后的所有系数-1/x_0(y)都是严格负的,常数项1之后的所有系数1/x_0(y)^2都是严格负的,除了y^3的零系数。

英文摘要:

I study the leading root x_0(y) of the partial theta function Θ_0(x,y) = \sum_{n=0}^\infty x^n y^{n(n-1)/2}, considered as a formal power series. I prove that all the coefficients of -x_0(y) are strictly positive. Indeed, I prove the stronger results that all the coefficients of -1/x_0(y) after the constant term 1 are strictly negative, and all the coefficients of 1/x_0(y)^2 after the constant term 1 are strictly negative except for the vanishing coefficient of y^3.

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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