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Polynomials in Many Variables: Real vs Complex Norms

✍ Scribed by R. Aron; B. Beauzamy; P. Enflo


Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
444 KB
Volume
74
Category
Article
ISSN
0021-9045

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✦ Synopsis


We study, for polynomials in many variables, the relations between the complex and the real sup-norms, and we give estimates involving the leading coefficients. We consider the case when the polynomial has a given degree, or some concentration at a given degree. The present paper is a contribution to a general field of investigation: For polynomials in many variables, what are the estimates independent of the number of variables? 1993 Academic Press. Inc


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## Abstract Let β€– Β· β€– denote the uniform norm in the unit disk of the complex plane β„‚. The main result in this note is as follows: __For any complex polynomial P of degree at most n and any Ξ±__ ∈ β„‚ __the inequality__ β€–__P__ β€– β©½ (__n__ + 1)(β€–__z P__ (__z__) + __Ξ±__ β€– ‐ |__Ξ±__ |) __holds.__ For any