کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4607452 | 1337858 | 2011 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Nikishin systems are perfect. The case of unbounded and touching supports
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موضوعات مرتبط
مهندسی و علوم پایه
ریاضیات
آنالیز ریاضی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
K. Mahler introduced the concept of perfect systems in the theory of simultaneous Hermite–Padé approximation of analytic functions. Recently, we proved that Nikishin systems, generated by measures with bounded support and non-intersecting consecutive supports contained on the real line, are perfect. Here, we prove that they are also perfect when the supports of the generating measures are unbounded or touch at one point. As an application, we give a version of the Stieltjes theorem in the context of simultaneous Hermite–Padé approximation.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Approximation Theory - Volume 163, Issue 6, June 2011, Pages 779–811
Journal: Journal of Approximation Theory - Volume 163, Issue 6, June 2011, Pages 779–811
نویسندگان
U. Fidalgo Prieto, G. López Lagomasino,