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.

Type to find tags:
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for questions about creating and using custom notations. For help on the use of the built-in operators, see syntax.
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Questions on the use of Mathematica to capture data from external sources.
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a toolkit for working with SQL databases built into Mathematica.
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Specific forms of data storage and file types external to Mathematica.
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Questions on using or implementing more or less common data structures such as linked lists, structs, trees, tries, heaps etc. in Mathematica.
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Mathematica pseudo-types Integer, Real, Rational, Complex String and Symbol and their use.
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Questions about Mathematica's date and time functions.
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Questions about debugging techniques, using the built-in debugger, and/or the Wolfram Workbench debugger.
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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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special notebook windows of the Mathematica front end.
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Questions on the symbolic (DSolve, DifferentialRoot) and numerical (NDSolve) solutions of differential equations in Mathematica.
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Questions on the use of Mathematica to find integer/rational solutions to equations.
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For questions about distributions built-in in Mathematica, and functions that operate on them. Also includes questions about defining your own distributions.
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Questions about making your own documentation similar to the built-in documentation style. Also about finding things in the documentation, working with the documentation, errors in the documentation, …
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Tag for questions relating to the automatic document creations features of Mathematica
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Questions about DownValues which specify function definitions for symbols.
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Questions relating to the dynamic family of functions in Mathematica, such as Dynamic, DynamicModule and Manipulate.