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{blackboard} is about the particular "double-stroke" font used, for example, to denote the sets of natural, rational, and real numbers in mathematics

is about the particular "double-stroke" font used, for example, to denote the sets of natural, rational, and real numbers in mathematics (not to be confused with "calligraphic" or "fraktur" fonts).

There are several ways to get blackboard bold letters in LaTeX; see this answer for a table.

  • If you use (or load or ), uppercase blackboard bold characters are available through \mathbb{ABC}.
  • The txfonts and pxfonts packages define two different styles of uppercase blackboard bold characters, \mathbb and \varmathbb.
  • The bbold, mathbbol, and mbboard packages define sans-serif blackboard uppercase letters, lowercase letters, and digits with \mathbb{ABCabc123}.
  • The bbm package defines serif blackboard bold letters, numbers, and digits with \mathbbm{ABCabc123}, sans-serif with \mathbbmss{ABCabc123}, and monospaced with \mathbbmtt{ABCabc123}.

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