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1 paper

math.FA2025

Best approximation of a three-variable function by sum of one-variable coordinate functions

Rashid A. Aliev, Vugar A. Guliyev, Amil F. Jabiyev

Consider the following approximation problem of a continuous function of three variables by the sum of three continuous functions of one variable: \[ E(f,Ω)=\inf||f(x,y,z)-ϕ(x)-Ï…