Dense and subspace dense subsets in finite-dimensional spaces

Abstract

This note is motivated by the article of Bamerni, Kadets and Kiliçman [J. Math. Anal. Appl. 435 (2), 1812--1815 (2016)]. We consider the remaining problem which claims that if $A$ is a dense subset of a finite dimensional space $X$, then there is a nontrivial subspace $M$ of $X$ such that $A\cap M$ is dense in $M$. We show that the above problem has a negative answer when $X={\mathbb{K}}^n$ ($\mathbb{K}=\mathbb{R}$ or $\mathbb{C}$) for every $n\ge 2$.

7 pages