JOURNAL OF APPROXIMATION THEORY

近似理论杂志致力于纯粹和应用近似理论及相关领域的进步。这些领域包括：?经典近似?抽象近似?建设性近似?近似度?傅里叶扩展?运营商的插值?一般正交系统?插值和正交?多变量近似?正交多项式?Padé近似?有理近似?一个和多个变量的样条函数?在欧几里德空间，球体和更一般的流形上通过径向基函数逼近?与经典谐波分析，正交多项式和近似理论有强连接的特殊函数（与组合，数论，表示理论，生成函数，形式理论等相反）?实函数或复函数理论，函数理论，差分或微分方程，函数空间或谐波分析的近似理论方面

The Journal of Approximation Theory is devoted to advances in pure and applied approximation theory and related areas. These areas include, among others:? Classical approximation ? Abstract approximation ? Constructive approximation ? Degree of approximation ? Fourier expansions ? Interpolation of operators ? General orthogonal systems ? Interpolation and quadratures ? Multivariate approximation ? Orthogonal polynomials ? Padé approximation ? Rational approximation ? Spline functions of one and several variables ? Approximation by radial basis functions in Euclidean spaces, on spheres, and on more general manifolds ? Special functions with strong connections to classical harmonic analysis, orthogonal polynomial, and approximation theory (as opposed to combinatorics, number theory, representation theory, generating functions, formal theory, and so forth) ? Approximation theoretic aspects of real or complex function theory, function theory, difference or differential equations, function spaces, or harmonic analysis