Subderivative

Sub`de·riv'a·tive noun A word derived from a derivative, and not directly from the root; as, 'friendliness' is a subderivative , being derived from 'friendly', which is in turn a derivative from 'friend.'
Found on http://www.encyclo.co.uk/webster/S/221

Subderivative

• (n.) A word derived from a derivative, and not directly from the root; as, `friendliness` is a subderivative, being derived from `friendly`, which is in turn a derivative from `friend.`
Found on http://thinkexist.com/dictionary/meaning/subderivative/

Subderivative

In mathematics, the subderivative, subgradient, and subdifferential generalize the derivative to functions which are not differentiable. The subdifferential of a function is set-valued. Subderivatives arise in convex analysis, the study of convex functions, often in connection to convex optimization. ==Examples== Consider the function f(x)=|x| whi...
Found on http://en.wikipedia.org/wiki/Subderivative
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