| Blackboard Bold |
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Blackboard bold is a style of Typeface often used for certain symbols in Mathematics and Physics texts, in which certain lines of the symbol (usually vertical, or near-vertical lines) are doubled. The symbols usually describe sets of Number s and are also referred to as '''double struck''', although attempting to produce them by double striking on a Typewriter is unlikely to give satisfactory results. The symbols are also nearly universal in their interpretation, unlike their normally-typeset counterparts, which are constantly reused. In some texts, these symbols are simply shown in Bold , and blackboard bold in fact originated from the attempt to write bold letters on Blackboard s in a way that clearly differentiated them from non-bold letters. Writing actual bold letters using chalk is simple when you turn the chalk sideways. It is frequently claimed that the symbols were first introduced by the group of , a member of the Bourbaki group, has publicly inveighed against the use of "blackboard bold" anywhere other than on a blackboard. 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; a blackboard bold R is written as \Bbb{R} in regular text and as \mathbb{R} in math mode.In table for these entries. The rest, however, are encoded outside the BMP, from U+1D538 to U+1D550 (uppercase, excluding those encoded in the BMP), U+1D552 to U+1D56B (lowercase) and U+1D7D8 to U+1D7E1 (digits). Being outside the BMP, these are relatively new and not widely supported.The following table shows some of the more common uses of blackboard bold. The first column shows the letter as typically rendered by the ubiquitous LaTeX markup system. The second column shows the Unicode codepoint. The third column shows the symbol itself (which will only display correctly if your browser supports Unicode and has access to a suitable font). The fourth column describes typical usage in mathematical texts. Note that . SEE ALSO EXTERNAL LINKS
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