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In mathematics, a differential operator is an operator defined as a function of the differentiation operator. (Def: http://en.m.wikipedia.org/wiki/Differential_operator)

In mathematics, a differential operator is an operator defined as a function of the differentiation operator. Reference: Wikipedia.

It is helpful to consider differentiation as an abstract operation that accepts a function and returns another function (in the style of a higher-order function in computer science).

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