Preservation of notion of C sets near zero over reals

There are several notions of largeness in a semigroup. N. Hindman and D. Strauss established that if $u,v\in \mathbb{N}$, $A$ is a $u\times v$ matrix with entries from $\mathbb{Q}$ and $\psi$ is a notion of a large set in $\mathbb{N}$, then $\{\vec{x}\in {\mathbb{N}}^v:A\vec{x}\in {\psi }^u\}$ is large in ${\mathbb{N}}^v$. Among the several notions of largeness, C sets occupies an important place of study because they exhibit strong combinatorial properties. The analogous notion of C set appears for a dense subsemigroup $S$ of $((0,\mathrm{\infty }),+)$ called a C-set near zero. These sets also have very rich combinatorial structure. In this article, we investigate the above result for C sets near zero in ${\mathbb{R}}^{+}$ when the matrix has real entries. We also develop a new characterisation of C-sets near zero in ${\mathbb{R}}^{+}$.