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 product functions bo198214 Administrator Posts: 1,389 Threads: 90 Joined: Aug 2007 05/31/2011, 02:02 PM (This post was last modified: 05/31/2011, 02:02 PM by bo198214.) (05/31/2011, 12:26 PM)tommy1729 Wrote: despite that simple condition , its not quite easy to me how to find f(z)/f(0) = 1 + a x + b x^2 + ... = (1 + a' x)(1 + b'x^2) ... with both expressions converging in the same domain ( or all of C ). Ya basically this is a polynomial approximation different from the usual powerseries one, which is easiest to handle. I was aware of the different domain of convergence already when discussing the Mittag-Leffler expansion/star. This is a polynomial approximatino that converges in the star-region, instead of a disk for the powerseries approximation. I wonder what approximation implies what region of convergence. For example is there a polynomial approximation that implies a quadratic region of convergence? But perhaps this more a question for mathoverflow. « Next Oldest | Next Newest »

 Messages In This Thread product functions - by tommy1729 - 05/31/2011, 12:26 PM RE: product functions - by bo198214 - 05/31/2011, 02:02 PM RE: product functions - by bo198214 - 05/31/2011, 02:13 PM RE: product functions - by tommy1729 - 05/31/2011, 11:00 PM RE: product functions - by tommy1729 - 06/01/2011, 05:31 PM RE: product functions - by tommy1729 - 06/01/2011, 05:38 PM

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