is about calculations in (La)TeX documents. A popular package is calc that redefines most length- and counter-setting macros (like \setcounter, \addtocounter, \setlength and \addtolength) to allow expression-style input.

Regular mathematical calculations are possible via the fp package, which provides infix or RPN notation for calculations. The powerful pgf package provides a similar and more extended functionality, as does LaTeX3's l3fp.

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