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Order And Stability Of Generalized Pade Approximations

机译:Pade逼近的阶数和稳定性

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摘要

Given a sequence of integers [n_0,n_1, …, n_r], where n_0,n_r ≥ 0 and n_i≥-1, i = 1, 2,..., r - 1, a sequence of r polynomialsrn(P0, P1,.....,Pr) is a generalized Pade approximation to the exponential function if ∑_i~(r=0)exp((r - i)z)Pi(z) = O(z~(p+1), where the order of the approximation p is given by p = ∑_i~r=0(n_i + 1) - 1. The main result of this paper is that if 2n_0 > P + 2, then ∑_i~r=0~w~(r-i)P_i(z) is not the stability polynomial of an A-stable numerical method. This result, known as the Butcher-Chipman conjecture, generalizes the corresponding result for rational Pade approximations. The special case, formerly known as the Ehle conjecture [B.L. Ehle, A-stable methods and Pade approximations to the exponential, SIAM J. Math. Anal. 4 (1973) 671-680], was subsequently proved by Hairer, Norsett and Wanner [G. Wanner, E. Hairer, S.P. N0rsett, Order stars and stability theorems, BIT 18 (1978) 475-489].
机译:给定整数序列[n_0,n_1,…,n_r],其中n_0,n_r≥0且n_i≥-1,i = 1,2,...,r-1,r多项式序列rn(P0,P1 ,.....,Pr)是∑_i〜(r = 0)exp((r-i)z)Pi(z)= O(z〜(p + 1)的指数函数的广义Pade近似,其中近似值p的阶数由p = ∑_i〜r = 0(n_i + 1)-1给出。本文的主要结果是,如果2n_0> P + 2,则∑_i〜r = 0〜 w〜(ri)P_i(z)不是A稳定数值方法的稳定性多项式,该结果被称为Butcher-Chipman猜想,它推广了有理Pade逼近的相应结果。埃勒猜想[BL埃勒,A稳定方法和指数的Pade近似,SIAM J. Math。Anal。4(1973)671-680],随后由Hairer,Norsett和Wanner [G. Wanner,E. Hairer]证明。 ,SP N0rsett,有序恒星和稳定性定理,BIT 18(1978)475-489]。

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