Finite difference

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.

单词	Backward difference operator
释义	Backward difference operator 英语百科 Finite difference 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.
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Backward difference operator

Finite difference