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单词 NablaActingOnProducts
释义

nabla acting on products


Let f, g be differentiableMathworldPlanetmathPlanetmath scalar fields and u, v differentiable vector fields in some domain of 3.  There are following formulae:

  • GradientMathworldPlanetmath of a product function
    (fg)=(f)g+(g)f

  • DivergenceMathworldPlanetmath of a scalar-multiplied vector
    (fu)=(f)u+(u)f

  • Curl of a scalar-multiplied vector
    ×(fu)=(f)×u+(×u)f

  • Divergence of a vector product
    (u×v)=(×u)v-(×v)u

  • Curl of a vector product
    ×(u×v)=(v)u-(u)v-(u)v+(v)u

  • Gradient of a scalar productMathworldPlanetmath
    (uv)=(v)u+(u)v+v×(×u)+u×(×v)
    or, using dyads,
    (uv)=(u)v+(v)u

  • Gradient of a vector product
    (u×v)=(u)×v-(v)×u

  • Divergence of a dyad product
    (uv)=(u)v+uv

  • Curl of a dyad product
    ×(uv)=(×u)v-u×v

Explanations

  1. 1.

    v means the operator vxx+vyy+vzz.

  2. 2.

    The gradient of a vector w is defined as the dyad w:=iwx+jwy+kwz.

  3. 3.

    The divergence and the curl of a dyad product are defined by the equation
    *(uv):=i*(uv)x+j*(uv)y+k*(uv)z,  where the asterisks are dots or crosses and the partial derivativesMathworldPlanetmath of the dyad product the expression (uv)x=uxv+uvx  and so on.

Titlenabla acting on products
Canonical nameNablaActingOnProducts
Date of creation2013-03-22 15:27:05
Last modified on2013-03-22 15:27:05
Ownerpahio (2872)
Last modified bypahio (2872)
Numerical id11
Authorpahio (2872)
Entry typeTopic
Classificationmsc 26B12
Classificationmsc 26B10
Related topicNabla
Related topicNablaNabla
Definesgradient of vector
Definesdivergence of dyad product
Definescurl of dyad product
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更新时间:2025/5/4 21:09:13