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finite difference  

Definition

  • A finite difference is a mathematical expression of the form f (x + b) − f (x + a). If a finite difference is divided by b − a, one gets a difference quotient. The approximation of derivatives by finite differences plays a central role in finite difference methods for the numerical solution of differential equations, especially boundary value problems. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Finite_difference)

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http://data.loterre.fr/ark:/67375/MDL-MMB0FMQ0-0

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