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Blackboard bold. Blackboard bold is a style of writing bold symbols on a blackboard by doubling certain strokes, commonly used in mathematical lectures, and the derived style of typeface used in printed mathematical texts. The style is most commonly used to represent the number sets ( natural numbers ), ( integers ), ( rational numbers ...
The blackboard bold letter style originated in the 1960s to distinguish bold letters from ordinary letters on a blackboard or using a typewriter; in professionally typeset documents, bold fonts were used for the same purpose. Since then, blackboard bold has gradually gained currency, and is now commonly used in mathematical printing to denote ...
Text formatting in citations should follow, consistently within an article, an established citation style or system. Options include either of Wikipedia's own template-based Citation Style 1 and Citation Style 2, and any other well-recognized citation system. Parameters in the citation templates should be accurate.
Blackboard bold. The blackboard bold typeface is widely used for denoting the basic number systems. These systems are often also denoted by the corresponding uppercase bold letter. A clear advantage of blackboard bold is that these symbols cannot be confused with anything else.
Uses. Reusable writing surface on which text or drawings are made. A blackboard or a chalkboard is a reusable writing surface on which text or drawings are made with sticks of calcium sulphate or calcium carbonate, known, when used for this purpose, as chalk. Blackboards were originally made of smooth, thin sheets of black or dark grey slate stone.
Blackboard bold. Certain objects, such as the real numbers R, are traditionally printed in boldface, or a double-struck font such as Blackboard Bold. Though both are acceptable, bolding is preferred as some browsers do not support the Unicode symbols, which lie outside the Basic Multilingual Plane. As with all such choices, the article should ...
File:Blackboard bold.svg. Size of this PNG preview of this SVG file: 800 × 223 pixels. Other resolutions: 320 × 89 pixels | 640 × 178 pixels | 1,024 × 286 pixels | 1,280 × 357 pixels | 2,560 × 714 pixels | 807 × 225 pixels. Original file (SVG file, nominally 807 × 225 pixels, file size: 11 KB) This is a file from the Wikimedia Commons.
The OpenType font format has the feature tag "mgrk" ("Mathematical Greek") to identify a glyph as representing a Greek letter to be used in mathematical (as opposed to Greek language) contexts. The table below shows a comparison of Greek letters rendered in TeX and HTML. The font used in the TeX rendering is an italic style.