二元函数用一元函数的构造性分解
Constructive decomposition of functions of two variables using functions of one variable
摘要:
给定一个平面上的紧集K,它不包含形成一个垂直和一个水平段的点的三元组,以及K上的一个连续实值映射f,我们给出了一个单变量g,h的实值连续映射的构造,使得f(x,y)= g(x)+h(y)对于K上的所有点(x,y).这提供了一个建设性的证明的一部分Sternfeld定理的基本嵌入在平面上。在证明中,我们构造了一个有限图序列,它提供了集合K的任意好的近似。
英文摘要:
Given a compact set K in the plane, which contains no triple of points forming a vertical and a horizontal segment, and a continuous real-valued map f on K, we give a construction of real-valued continuous maps of one variable g,h such that f(x,y)=g(x)+h(y) for all points (x,y) from K. This provides a constructive proof of a part of Sternfeld's theorem on basic embeddings in the plane. In the proof we construct a sequence of finite graphs, which provide an arbitrarily good approximation of the set K.
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