Basic embeddings and Hilbert's 13th problem on superpositions (in Russian)

Details Basic embeddings and Hilbert's 13th problem on superpositions (in Russian) Basic embeddings and Hilbert's 13th problem on superpositions (in Russian)

2010-01-22

arxiv.org/abs/1001.4011v1

Mat. Prosveschenie, 14 (2010) 143-174

Mathematics

Functional Analysis

22 pages, 7 figures

Scientific paper

This note is purely expository. We show how in the course of the Kolmogorov-Arnold solution of Hilbert's 13-th problem on superpositions there appeared the notion of a basic embedding. A subset K of R^2 is {\it 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 and 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.

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