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 on the discrete and continuous Fourier analysis functions of Mathematica, as well as the FourierSeries` package.
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Questions on the application of Mathematica to geometric problems. You might also consider adding the [graphics] tag, if appropriate.
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Questions about Mathematica's date and time functions.
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Questions on the Computable Document Format (CDF) that allows Mathematica notebooks to be embedded within media for easy viewing and manipulation. Do not use this tag for questions on cumulative distr…
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Questions about the function Assuming[], the $Assumptions system variable, and the Assumptions option of functions such as Simplify[] and Integrate[].
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the back-end application thread that does the actual evaluation of all non-graphical expressions. It can be accessed directly through the console but is more commonly working behind the…
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a suite of Mathematica functions that implement a protocol for the communication/interfacing of Mathematica with external programs.
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GUI-construction involves everything that is used to programmatically construct a custom graphical user interface under Mathematica.
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Questions on the associative data-structure introduced in Mathematica version 10.
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intended for the review and improvement of style for already functioning code. It not meant to change the objective of the code.
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Questions related to the application of Mathematica to problems in physics.
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Questions on the use of Mathematica in combinatorics, including the Combinatorica add-on package.
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Tag for questions about building histograms in Mathematica. Apart from generating the graphics, and prettifying them, this also includes methods to extract their data.
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Questions relating to the importing, exporting, and extraction of data from PDF files
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Questions relating to working with textual information: textual analysis, data mining, etc.
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Styles define how Mathematica notebooks, cells and expressions are formatted, displayed, evaluated and interacted with.
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Questions on the number-theoretic functionality of Mathematica.
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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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Questions on the sorting/ordering functions of Mathematica (Sort, SortBy, Ordering, etc.).
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For questions regarding the underlying implementation of built-in functions.
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Questions on filtering or selecting data based on certain criteria. This is to be used with primary tags such as list-manipulation, string-manipulation or signal-processing, with the primary tag indic…
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the ultimate atoms of symbolic data. Every symbol has a unique name, exists in a certain Mathematica context or namespace, and can have a variety of types of values and attribu…
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Questions about any kind of interaction with $\TeX$, $\LaTeX$, and friends, including transferring text/code to/from $\TeX$, using Mathematica graphics in LaTeX documents etc.
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Questions relating to different typefaces and their use in various Mathematica outputs, including graphics, notebooks and exported output.
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Questions related to displaying identifiable labels in graphics or any other expressions, such as in `AxesLabel` and `Labeled`. Not to be confused with Goto-Label.
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For questions on interfacing or getting Mathematica to work together with other software or technologies.
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Questions on trigonometric and hyperbolic functions, as well as their inverses, in Mathematica.
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Questions about calculating with units in Mathematica.
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For questions specific to Version 8 of Mathematica.
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For interacting with the Mathematica front-end using the keyboard: shortcut keys, KeyEvents, keyboard navigation, etc.