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单词 Del operator
释义

Del operator

中文百科

Nabla算子 Del

(重定向自Del operator)

矢量微分算子Nabla算子,又称劈形算子倒三角算子,是一个微分算子,符号为\nabla

其形式化定义为:

\nabla = {d \over dr}

在n维空间中,分母dr为含n个分量的矢量,因而\nabla本身就是个n维矢量算子。

三维情况下,\nabla = {\frac{\partial }{\partial x}}\mathbf{i}+ 
{\frac{\partial }{\partial y}}\mathbf{j}+ 
{\frac{\partial }{\partial z}}\mathbf{k}\nabla = ({\frac{\partial }{\partial x}},{\frac{\partial }{\partial y}}, 
{\frac{\partial }{\partial z}})

二维情况下,\nabla = {\frac{\partial }{\partial x}}\mathbf{i}+ 
{\frac{\partial }{\partial y}}\mathbf{j}\nabla = ({\frac{\partial }{\partial x}},{\frac{\partial }{\partial y}})

\nabla作用于不同类型的量,得到的就是不同类型的新量:

Nabla算子的名字来自希腊语中一种被称为纳布拉琴的竖琴。相关的词汇也存在于亚拉姆语和希伯来语中。

该符号的另一常见的名称是atled,因为它是希腊字母Δ倒过来的形状。除了atled外,它还有一个名称是del

劈形算子在标准HTML中写为&nabla,而在LaTeX中为\nabla。在Unicode中,它是十进制数8711,也即十六进制数0x2207。

英语百科

Del Nabla算子

(重定向自Del operator)
Del operator,represented bythe nabla symbol
DCG chart:

A simple chart depicting all rules pertaining to second derivatives.
D, C, G, L and CC stand for divergence, curl, gradient, Laplacian and curl of curl, respectively.

Arrows indicate existence of second derivatives. Blue circle in the middle represents curl of curl, whereas the other two red circles (dashed) mean that DD and GG do not exist.
El arpa, el instrumento que da nombre al símbolo nabla.

Del, or nabla, is an operator used in mathematics, in particular, in vector calculus, as a vector differential operator, usually represented by the nabla symbol . When applied to a function defined on a one-dimensional domain, it denotes its standard derivative as defined in calculus. When applied to a field (a function defined on a multi-dimensional domain), del may denote the gradient (locally steepest slope) of a scalar field (or sometimes of a vector field, as in the Navier–Stokes equations), the divergence of a vector field, or the curl (rotation) of a vector field, depending on the way it is applied.

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更新时间:2025/6/19 20:36:26