𝐑

See also: Appendix:Variations of "r"

𝐑 U+1D411, 𝐑
MATHEMATICAL BOLD CAPITAL R
← 𝐐
[U+1D410] 		Mathematical Alphanumeric Symbols 𝐒 →
[U+1D412]

Translingual

Alternative forms

The usage of blackboard bold dates to the 1960s.

Etymology

In Stetigkeit und irrationale Zahlen (1872) Richard Dedekind uses 𝐑 to denote rational numbers and ℜ to denote real numbers.

Symbol

𝐑

  1. (mathematics) The set of real numbers.
  2. (mathematics) The set of real numbers equipped with any of its standard structure; the real line.

Derived terms

  • 𝐑-order tree (English)
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