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Video id:  #131 (enlarge) 
Post date:  5/27/2009 
Posted by:  Jim 
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Differentiation

Definition: In calculus, a branch of mathematics, the derivative is a measure of how a function changes as its input changes. Loosely speaking, a derivative can be thought of as how much a quantity is changing at a given point. For example, the derivative of the position (or distance) of a vehicle with respect to time is the instantaneous velocity (respectively, instantaneous speed) at which the vehicle is travelling.
Source: Wikipedia.org

Listed under: Calculus, Mathematical Analysis
6:43pm 9/6/2011
User: D_Seita
Post count: 5
This is a good sign for "differentiation," and is almost the exact same sign that I see people sign "derivative."