|
On the representation of functions as a sum of several compositions
V. A. Medvedev
Abstract:
Let $\varphi_i$ be continuous mappings of a compactum $X$ onto compacta $Y_i$, $i=1,\dots,n$. The following theorem is known for $n=2$: if any bounded function $f$ on $X$ can be represented in the form $f=g_1\circ\varphi_1+g_2\circ\varphi_2$, where $g_1$ and $g_2$ are bounded functions on $Y_1$ and $Y_2$, then any continuous $f$ can be represented in the same form with continuous $g_1$ and $g_2$. An example is constructed showing that the analogous theorem is false for $n>2$.
Received: 24.04.1990
Citation:
V. A. Medvedev, “On the representation of functions as a sum of several compositions”, Math. USSR-Sb., 74:1 (1993), 119–130
Linking options:
https://www.mathnet.ru/eng/sm1378https://doi.org/10.1070/SM1993v074n01ABEH003339 https://www.mathnet.ru/eng/sm/v182/i10/p1379
|
|