This is LaTeX code:

[latex]
\mathbb{R}^n \times \mathbb{R}^3 \rightarrow \mathbb{R}^3, \mathbb{R}^n \times \mathbb{R} \times \mathbb{R} \times \mathbb{R} \rightarrow \mathbb{R}^3, \mathbb{R} \times \mathbb{R} \times \cdots \times \mathbb{R} \rightarrow \mathbb{R}^3
[/latex]