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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Questions on Notebooks (*.nb, *.ma in earlier versions), structured interactive documents produced by Mathematica that can contain text, graphics, sound, calculations, typeset expressions, and user in…
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Tag for questions about using various number bases in Mathematica. This includes, but is not restricted to base notation, base conversion and formatting issues.
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Questions about interpretation of numeric input or how Mathematica stores and manipulates numbers internally.
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Questions on the number-theoretic functionality of Mathematica.
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Questions on the use of numerical functions NIntegrate and NDSolve.
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Questions on the numerical functions of Mathematica, implementing numerical methods and numerical computing with Mathematica.
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Tag for questions on Optical Character Recognition (OCR), including the Mathematica function TextRecognize[].
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Questions about the combination of Mathematica and MS Office, WPS Office, LibreOffice, OpenOffice etc.
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OpenCLLink allows the Wolfram Language to use the OpenCL parallel computing language. It contains functions that facilitate loading user-defined OpenCL functions into the Wolfram Language. OpenCLLink …
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Questions about using or composing operators--functional mappings from one state or vector space to another.
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Questions on the use of Mathematica to model light propagation and interaction with matter. This tag should be used for questions specifically related to the physics of light--problems dealing with ra…
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Tag for questions about using optional arguments in Mathematica functions.
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Questions dealing with optional named arguments of Mathematica functions.
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Questions specific to usage of Mathematica on the Mac OS X operating system.
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Questions about the form and content of output returned by Mathematica for a given input or function application. This can include specific differences produced by older versions of Mathematica.
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Specify and control how Mathematica formats its output, including rich text, equations and graphics.
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self-contained bundles of Mathematica code that add new functions and other functionality.