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 special mathematical functions implemented in Mathematica.
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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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Questions relating to working with textual information: textual analysis, data mining, etc.
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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 discrete and continuous Fourier analysis functions of Mathematica, as well as the FourierSeries` package.
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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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Questions about the function Assuming[], the $Assumptions system variable, and the Assumptions option of functions such as Simplify[] and Integrate[].
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Questions on the use of Mathematica in combinatorics, including the Combinatorica add-on package.
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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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For questions specific to Version 8 of Mathematica.
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Questions relating to the importing, exporting, and extraction of data from PDF files
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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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Styles define how Mathematica notebooks, cells and expressions are formatted, displayed, evaluated and interacted with.
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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 on the sorting/ordering functions of Mathematica (Sort, SortBy, Ordering, etc.).
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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 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 relating to different typefaces and their use in various Mathematica outputs, including graphics, notebooks and exported output.
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Questions on trigonometric and hyperbolic functions, as well as their inverses, in 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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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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For questions on interfacing or getting Mathematica to work together with other software or technologies.
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For interacting with the Mathematica front-end using the keyboard: shortcut keys, KeyEvents, keyboard navigation, etc.
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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 regarding the underlying implementation of built-in functions.
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For questions relating to assignments to symbols, patterns, or expressions.
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Questions specific to usage of Mathematica on the the Mac OS X operating system
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Questions on the number-theoretic functionality of Mathematica.
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Questions related to the application of Mathematica to problems in physics.