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In mathematics, a variable (from Latin variabilis, "changeable") is a symbol, typically a letter, that refers to an unspecified mathematical object. [1] [2] [3] One says colloquially that the variable represents or denotes the object, and that any valid candidate for the object is the value of the variable.
Gallian has won both the Allendoerfer and Evans awards for exposition from the Mathematical Association of America (MAA) and was the Pólya lecturer for the MAA from 1999 to 2001.