Basic embeddings and Hilbert's 13th problem

Details Basic embeddings and Hilbert's 13th problem Basic embeddings and Hilbert's 13th problem

2010-03-08

arxiv.org/abs/1003.1586v1

Mathematics

Functional Analysis

14 pages, 6 figures

Scientific paper

This note is purely expository. In the course of the Kolmogorov-Arnold solution of Hilbert's 13th problem on superpositions there appeared the notion of basic embedding. A subset K of R^2 is basic if for each continuous function f:K->R there exist continuous functions g,h:R->R such that f(x,y)=g(x)+h(y) for each point (x,y) in K. We present descriptions of basic subsets of the plane (with a proof) and description of graphs basically embeddable into the plane (solutions of Arnold's and Sternfeld's problems). We present some results and open problems on the smooth version of the property of being basic. This note is accessible to undergraduates and could be an interesting easy reading for mature mathematicians. The two sections can be read independently on each other.

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