It then made its way back into print form as a separate style from ordinary bold, possibly starting with the original 1965 edition of Gunning and Rossi's textbook on complex analysis. === Use in textbooks === In the 1960s and 1970s, blackboard bold spread quickly in classrooms and is now widely used in the English- and French-speaking worlds.

It then made its way back into print form as a separate style from ordinary bold, possibly starting with the original 1965 edition of Gunning and Rossi's textbook on complex analysis. === Use in textbooks === In the 1960s and 1970s, blackboard bold spread quickly in classrooms and is now widely used in the English- and French-speaking worlds.

It then made its way back into print form as a separate style from ordinary bold, possibly starting with the original 1965 edition of Gunning and Rossi's textbook on complex analysis. === Use in textbooks === In the 1960s and 1970s, blackboard bold spread quickly in classrooms and is now widely used in the English- and French-speaking worlds.

In 1993, for the 14th edition, it advised that "blackboard bold should be confined to the classroom" (13.14).

In 2003, for the 15th edition, it stated that "open-faced (blackboard) symbols are reserved for familiar systems of numbers" (14.12). == Encoding == TeX, the standard typesetting system for mathematical texts, does not contain direct support for blackboard bold symbols, but the add-on AMS Fonts package (amsfonts) by the American Mathematical Society provides this facility for uppercase letters (e.g., \mathbb{R} is written as \mathbb{R}).

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