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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Questions about solutions and support for mathematical typesetting and layout, and the appearance of elements in input and output as displayed by the front-end.
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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.
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Questions about Entity expressions and the use of standardized representations of specific real-world entities.
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Questions on the analytic and numeric equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).
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Questions seeking help understanding error messages and fixing errors.
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Questions about how Mathematica evaluates expressions, tracing evaluation (Trace*), handling expressions in unevaluated form (Hold*, Unevaluated), nonstandard evaluation, etc.
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Questions asking for an example to be provided, or asking for help understanding examples.
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For questions about importing from or exporting to Microsoft Excel sheets, and interfacing to Microsoft Excel using COM or other methods.