I was studing and I can't understand the meaning of a notation. Let $\mathcal{F}(I)$ be the real algebra of functions $I \rightarrow \mathbb{R}$, where $I$ is a non-empty and finite set. We denote the space spaned by the unit $1 \in \mathcal{F}(I)$ as $\mathbb{R}$, it is,
\begin{equation} \mathbb{R} = \mathbb{R} \cdot 1 := \{c\cdot1 \in \mathcal{F}(I):c \in \mathbb{R}\} \end{equation}
I understood that $\mathbb{R}$ is the set of the constant functions. So, if I have a function with the domain $\mathcal{F}(I)/\mathbb{R}$, let's say $\rho$, what can the notation $\rho(f+\mathbb{R})$ mean?