The Linearity of differentiation reference article from the English Wikipedia on 24-Jul-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Linearity of differentiation

This property of the derivative, follows from the sum rule in differentiation and the constant factor rule in differentiation. Thus we can say that the act of differentiation linear, or the differential operator is a linear operator.

Let f and g be functions. Now consider:

By the sum rule in differentiation, this is:

By the constant factor rule in differentiation, this reduces to:

Hence we have:

Omitting the brackets, this is often written as:

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