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arXiv 1608.01010math.CA
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一类新的阶乘级数展开式及其应用

A new type of factorial series expansions and applications

O. Costin, R. D. Costin

摘要:

我们构造了一类新的收敛渐近表示,并矢阶乘展开式。它们的收敛是几何的,收敛区域可以包括斯托克斯射线,并且经常向下延伸到0^+。对于特殊函数如Bessel、Airy、Ei、Erfc、Gamma等,该区域是C,没有任意选择的射线,有效地为特殊函数提供一致收敛的渐近展开。我们证明了相对一般的函数,Ecalle复苏的具有收敛的并矢阶乘展开。我们证明了并矢展开是数值上有效的表示。展开转化为表示的预解式的自伴算子在系列的相关酉演化算子评估在一些规定的点(或者,在生成的半群的正运营商)。

英文摘要:

We construct a new type of convergent asymptotic representations, dyadic factorial expansions. Their convergence is geometric and the region of convergence can include Stokes rays, and often extends down to 0^+. For special functions such as Bessel, Airy, Ei, Erfc, Gamma and others, this region is C without an arbitrarily chosen ray effectively providing uniform convergent asymptotic expansions for special functions. We prove that relatively general functions, Ecalle resurgent ones possess convergent dyadic factorial expansions. We show that dyadic expansions are numerically efficient representations. The expansions translate into representations of the resolvent of self-adjoint operators in series in terms of the associated unitary evolution operator evaluated at some prescribed points (alternatively, in terms of the generated semigroup for positive operators).

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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