String (computer science): Difference between revisions

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In theoretical computer science, one starts with a [[empty set|non-empty]] [[finite]] [[set]] called the ''alphabet''; strings are then defined as finite sequences of elements from the alphabet, including the empty sequence. The set of all strings over a given alphabet, together with string concatentation, then forms a [[monoid]], in fact a free monoid. [[Formal language]]s, the central objects of study, are defined as [[subset]]s of this monoid.
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A '''string''' is a vibrating cord of metal, nylon, horsehair, or other substance that vibrates to produce a tone in a variety of [[musical instrument]]s. '''Strings''' can also refer to the section of an [[orchestra]] or band consisting in stringed instruments. See [[string instrument]].
See [[String]]
 
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A '''string''' is a concept in [[quantum string theory]].