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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Tag for all questions about getting a connection to, setting up, or accessing a SQL database using Mathematica, particularly (but not restricted to) using Mathematica's DatabaseLink package.
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Questions about the usages of the various initialization files used by Mathematica. The most common ones are the init.m files that can be found in some Mathematica system folders and in a few specific…
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Specific forms of data storage and file types external to Mathematica.
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Tag for questions about using optional arguments in Mathematica functions.
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Tag for questions about compatibility among various versions of Mathematica, and compatibility issues of Mathematica with various operating systems.
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special notebook windows of the Mathematica front end.
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For questions related to user defined caching mechanisms, memoization, in particular.
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Abstract manipulation of symbols. Transforming an algebraic expression into the desired form.
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Questions about character encoding and decoding. This includes, but is not restricted to, conversion of characters to their numerical value in a character table and vice versa and conversion of charac…
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Questions on the group-theoretic functionality of Mathematica.
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For questions about texture mapping, particularly using the Texture function.
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Questions about looping or recursive structures that do not complete. Such structures include While, For, FixedPoint, and NestWhile. Also user defined functions that make recursive calls to themselves…
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About using and customizing the front-end's auto-completion feature
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Questions on the internal error messages of Mathematica.
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