# How do you pronounce $\mathbb{R}^2, \dots, \mathbb{R}^n$ [closed]

I've been starting some vector calculus and I keep pronouncing it "R squared" in my head, which is clearly wrong. What is a better way to pronounce it, so that I can state things like $f: \mathbb{R} \rightarrow \mathbb{R}^2$ out loud?

## closed as primarily opinion-based by Najib Idrissi, RE60K, Robert Cardona, Daniel Fischer♦Mar 9 '15 at 14:35

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• R-2, R-3, ..., R-n (so read it as if there were no superscript there). – beep-boop May 7 '14 at 12:53
• Completely disjoint comment: You probably want $\to$ instead of $\mapsto$. – fuglede May 7 '14 at 12:53
• I say "R n", since in italian we say "Erre enne". – Siminore May 7 '14 at 12:55
• @fuglede thanks, changed it. – porglezomp May 7 '14 at 12:59
• Would you just pronounce all of those as "ar?" – porglezomp May 7 '14 at 13:01

Actually, "$\mathbb{R}$-squared" is fine.
To see this, imagine you have a set $X$ with $n \in \mathbb{N}$ elements. How many elements does $X^2$ have? You guessed it, it has $n^2$ elements.