- 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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- 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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012