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Oct 4, 2017 at 9:59 comment added Philipp Thanks a lot for the answer. I haven't thought that it is so hard. The book of Walsh pointed me to the book of Akhiezer ("Theory of Approximation"), which I found quite helpful to get a good idea of approximation theory. Unfortunately, of course, without a direct answer to my problem...
Sep 29, 2017 at 17:38 history answered user111 CC BY-SA 3.0