On 12/17/2012 1:28 PM, John Clark wrote:



On Mon, Dec 17, 2012 at 1:08 PM, Richard Ruquist <yann...@gmail.com <mailto:yann...@gmail.com>> wrote:

    > I thought it was the product of two quaternions that is
non-commutative

Yes,  multiplication is  non-commutative for quaternions

    > and that its primary feature is handling rotations in 3d space.


I don't know what you mean by primary feature but quaternions can be used for handling rotations in 3d space.

  John K Clark


Hi,

    Try 2-spinors, they are much more elegant. ;-)

--
Onward!

Stephen

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