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From: Hane on 15 Jun 2010 09:09
Hi,
In electromagnetics, there is a cross product of three vectors that I do not know what that means. (there is no bracket involved)

AxBxC=???

is it equal to Ax(BxC) or there is a definition for that?

Thanks,
Hane
From: Wayne King on 15 Jun 2010 09:27
"Hane " <jesuismoi28(a)yahoo.com> wrote in message <hv7u1g$1ug$1(a)fred.mathworks.com>...
> Hi,
> In electromagnetics, there is a cross product of three vectors that I do not know what that means. (there is no bracket involved)
>
> AxBxC=???
>
> is it equal to Ax(BxC) or there is a definition for that?
>
> Thanks,
> Hane

Hi Hane,

http://en.wikipedia.org/wiki/Cross_product

In Matlab, the function cross() computes the cross product of two vectors in space.

Wayne
From: Hane on 15 Jun 2010 09:33
"Wayne King" <wmkingty(a)gmail.com> wrote in message <hv7v38$ajf$1(a)fred.mathworks.com>...
> "Hane " <jesuismoi28(a)yahoo.com> wrote in message <hv7u1g$1ug$1(a)fred.mathworks.com>...
> > Hi,
> > In electromagnetics, there is a cross product of three vectors that I do not know what that means. (there is no bracket involved)
> >
> > AxBxC=???
> >
> > is it equal to Ax(BxC) or there is a definition for that?
> >
> > Thanks,
> > Hane
>
> Hi Hane,
>
> http://en.wikipedia.org/wiki/Cross_product
>
> In Matlab, the function cross() computes the cross product of two vectors in space.
>
> Wayne
=================================

That function calculates the cross product of 2 vectors not three. I am interested in the mathematical definition of this 3 vector product.
Hane
From: Dinesh Iyer on 15 Jun 2010 09:51
Hello,
This link would be more useful in defining the definition of the cross product of three vectors. It is referred to as a vector triple product:
http://en.wikipedia.org/wiki/Triple_product#Vector_triple_product

Dinesh
From: David Young on 15 Jun 2010 10:48
"Hane " <jesuismoi28(a)yahoo.com> wrote in message <hv7u1g$1ug$1(a)fred.mathworks.com>...
> Hi,
> In electromagnetics, there is a cross product of three vectors that I do not know what that means. (there is no bracket involved)
>
> AxBxC=???
>
> is it equal to Ax(BxC) or there is a definition for that?
>
> Thanks,
> Hane

As far as I know, AxBxC is not well-defined. The author presumably means either Ax(BxC) or (AxB)xC, but without the brackets it is not possible to say which.

Another possibility is that it is a mistake for the vector triple product, A.BxC

cross(A, cross(B, C)) would evaluate Ax(BxC) if that is what is wanted.
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