A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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For questions related to user defined caching mechanisms, memoization, in particular.
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the process during which a piece of Mathematica code is prepared for distribution or for the internet.
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Questions on the internal error messages of Mathematica.
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Questions about integrating Mathematica and the statistics package R using the RLink functionality provided with Mathematica.
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Questions on the application of Mathematica to geography, including the use of the CountryData[] and CityData[] functions. Not to be confused with geodesy.
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Questions on calling external executables, not necessarily through MathLink.
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Clearing symbol values, removing symbols from memory and general garbage collection.
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Questions on the group-theoretic functionality of Mathematica.
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Questions on the importing/exporting of video files in Mathematica, as well as the use of Mathematica to manipulate video files.
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Questions about Mathematica licenses, license restrictions, password files, network license servers, license costs etc.
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Questions about the Text based file format CSV (Comma Seperated Values). Questions include, but are not restricted to, importing from and exporting to this file format.
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Questions on the use of Mathematica to find integer/rational solutions to equations.