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 the analytic and numeric equation solving functions of Mathematica (Solve, Reduce, NSolve, FindRoot, DSolve, RSolve, etc.).
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For questions on interpreting existing error messages that you have encountered, as well as writing and managing messages, assertions and checks for your own functions.
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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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For questions about importing from or exporting to Microsoft Excel sheets, and interfacing to Microsoft Excel using COM or other methods.
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Questions on converting data, graphics, sound etc. from Mathematica into other file formats.
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How to manipulate expressions structurally, not necessarily complying with the rules of algebra.
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Questions about Mathematica's predicate functions.
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Questions on obtaining files and directory structure/information and manipulating the said structure/information, searching/renaming particular files in a directory, etc., in an OS independent manner.
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Questions on the financial functions of Mathematica.
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Questions on the use of Mathematica to construct models for approximating empirical data. (FindFit[], Fit[], LinearModelFit[], NonlinearModelFit[], 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 on typesetting and making your expressions, matrices, operators, equations or formulae look how you want them to.
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Questions about interfacing Mathematica and Fortran. This also includes conversion of Fortran style numbers to Mathematica style.
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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 related to the Mathematica front-end (graphical user interface).
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