We construct a family of polynomial maps $\mathbb{R}^2\rightarrow\mathbb{R}^2$
such that their images are open semialgebraic sets whose topological exteriors
have arbitrarily many connected components, which are parametric semilines.
@article{1228834301,
author = {Ueno
,
Carlos},
title = {A note on boundaries of open polynomial images of $\mathbb R^2$},
journal = {Rev. Mat. Iberoamericana},
volume = {24},
number = {2},
year = {2008},
pages = { 981-988},
language = {en},
url = {http://dml.mathdoc.fr/item/1228834301}
}
Ueno
,
Carlos. A note on boundaries of open polynomial images of $\mathbb R^2$. Rev. Mat. Iberoamericana, Tome 24 (2008) no. 2, pp. 981-988. http://gdmltest.u-ga.fr/item/1228834301/