chain rule
noun Mathematics.
the theorem that defines the method for taking the derivative of a composite function.
Origin of chain rule
First recorded in 1860–65
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British Dictionary definitions for chain rule
chain rule
noun
maths
a theorem that may be used in the differentiation of the function of a function. It states that d u /d x = (d u /d y)(d y /d x), where y is a function of x and u a function of y