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Overline
An overline, overscore, or overbar, is a typographical feature of a horizontal and vertical, horizontal line drawn immediately above the text. In old mathematical notation, an overline was called a ''vinculum (symbol), vinculum'', a notation for grouping symbols which is expressed in modern notation by parentheses, though it persists for symbols under a radical sign. The original use in Ancient Greek was to indicate compositions of Greek alphabet, Greek letters as Greek numerals. In Latin, it indicates Roman numerals multiplied by a thousand and it forms medieval abbreviations (sigla). Marking one or more words with a continuous line above the characters is sometimes called ''overstriking'', though overstriking generally refers to printing one character on top of an already-printed character. An overline, that is, a single line above a chunk of text, should not be confused with the macron (diacritic), macron, a diacritical mark placed above (or sometimes below) ''individual'' le ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vinculum (symbol)
\overline = 0. \overline Y = \overline \sqrt[n] a-\overline = a − (b + c) bracketing function Vinculum usage A vinculum () is a horizontal line used in mathematical notation for various purposes. It may be placed as an ''overline'' or ''underline'' above or below a mathematical expression to group the expression's elements. Historically, vincula were extensively used to group items together, especially in written mathematics, but in modern mathematics its use for this purpose has almost entirely been replaced by the use of parentheses. It was also used to Roman numerals#Vinculum, mark Roman numerals whose values are multiplied by 1,000. Today, however, the common usage of a vinculum to indicate the repetend of a repeating decimal is a significant exception and reflects the original usage. History The vinculum, in its general use, was introduced by Frans van Schooten in 1646 as he edited the works of François Viète (who had himself not used this notation). However, ea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
