...
首页> 外文期刊>Canadian Journal of Mathematics >Ray sequences of best rational approximants for $|x|^alpha$
【24h】

Ray sequences of best rational approximants for $|x|^alpha$

机译:$ | x | ^ alpha $的最佳有理近似值的射线序列

获取原文
           

摘要

The convergence behavior of best uniform rationalapproximations $r^ast_{mn}$ with numerator degree~$m$and denominator degree~$n$ to the function $|x|^alpha$,$alpha>0$, on $[-1,1]$ is investigated. It is assumedthat the indices $(m,n)$ progress along a ray sequence inthe lower triangle of the Walsh table, {it i.e.} thesequence of indices ${ (m,n)}$ satisfies$${mover n} ightarrow cin [1, infty)quadhbox{as } m+n ightarrowinfty.$$In addition to the convergence behavior, the asymptoticdistribution of poles and zeros of the approximants and thedistribution of the extreme points of the error function$|x|^alpha - r^ast_{mn} (x)$ on $[-1,1]$ will be studied.The results will be compared with those for paradiagonalsequences $(m=n+2[alpha/2])$ and for sequences of bestpolynomial approximants.
机译:最佳均匀有理逼近度$ r ^ ast_ {mn} $在函数[$ | -x | ^ alpha $,$ alpha> 0 $上的分子度〜$ m $和分母度〜$ n $的收敛性。 1,1] $被调查。假定索引$(m,n)$在Walsh表的下三角沿射线序列前进,{即}索引$ {(m,n)} $的这些满足$$ {mover n} [1,infty)quadhbox {as} m + n ightarrowinfty。$$除了收敛行为外,近似值的极点和零点的渐近分布以及误差函数的极点分布$ | x | ^ alpha-r将研究$ [-1,1] $上的^ ast_ {mn}(x)$。将结果与对角线序列$(m = n + 2 [alpha / 2])$和最佳多项式序列的结果进行比较近似值。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号