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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For questions about persistence, i.e., storing variable values or function definitions beyond the lifetime of individual Mathematica sessions.
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For questions about operator precedence.
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Questions on peak detection algorithms and problems, including applications of the built-in FindPeaks, PeakDetect, MaxDetect and MinDetect.
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a subspace of R^n with codimension 1, therefore n-1 coordinates are enough to represent any point on the simplex. A 2D simplex can be plotted as a ternary plot.
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Questions on working with templates in Mathematica, File/String/Notebook/Expression Templates and the functions used for manipulations like TemplateApply.
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Tag for questions about backslides/backsets/degenerations/degradations/regressions/retrogressions in newer versions of Mathematica, notice this tag isn't for bugs and compatibility issues.
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a reduced price license for non-professional use.
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