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Total Differential of the First Order


	The total differential of a function of two variables is given by definition: . Then its total increment is given by , where and as . The differential is the principal part of , which means that more rapidly than as .


	Contributed by: Izidor Hafner
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as

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Partial Derivatives in 3D (The Wolfram Demonstrations Project)

Directional Derivatives in 3D (The Wolfram Demonstrations Project)

Partial Derivative (Wolfram MathWorld)

"Total Differential of the First Order" from The Wolfram Demonstrations Project
http://demonstrations.wolfram.com/TotalDifferentialOfTheFirstOrder/

Contributed by: Izidor Hafner

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