What it means
The blackboard-bold R is the set of all real numbers: every point on the number line, including fractions and numbers such as √2 and π. ℝⁿ is the space of lists of n real numbers, such as points in the plane (ℝ²) or space (ℝ³).
Read aloud in real formulas
f : ℝ → ℝ
Aethel says
f maps the real numbers to the real numbers
a function from real numbers to real numbers
x ∈ ℝⁿ
Aethel says
x is in R n
x is a vector of n real numbers
Typing it
- LaTeX
- \mathbb{R}
- Unicode
- U+211D
Questions
How do you say ℝ out loud?
It is usually read “the real numbers”, and also “R”.
What does ℝ mean in maths?
The blackboard-bold R is the set of all real numbers: every point on the number line, including fractions and numbers such as √2 and π. ℝⁿ is the space of lists of n real numbers, such as points in the plane (ℝ²) or space (ℝ³).
How do you type ℝ?
In LaTeX, write \mathbb{R}. Its Unicode code point is U+211D.