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摘要
A theorem is proved concerning approximation of analytic functions by multivariate polynomials in the s-dimensional hypercube. The geometric convergence rate is determined not by the usual notion of degree of a multivariate polynomial, but by the Euclidean degree, defined in terms of the 2-norm rather than the 1-norm of the exponent vector k of a monomial x (k1)(1) ... x (ks)(s) .
- 出版日期2017-11
