[racket] OT: SU(2) and friends

From: Hendrik Boom (hendrik at topoi.pooq.com)
Date: Sat Apr 23 10:34:33 EDT 2011

On Fri, Apr 22, 2011 at 08:08:08PM +0100, Paul Ellis wrote:
> Many thanks for the continuing interest. 
> As you say, the 2nd is closer to my level and more accessible to me.
> (The first is likely to take me rather longer to be able to tackle.)
> Something  I came across in the late Pertti Lounesto's "Clifford
> Algebras and Spinors" (2e, 2001; ISBN 0-521-00551-5), which resembles
> your 2nd ref,  makes statements such as: 
> "In general, a rotation in R^4 has two invariant planes which are
> completely orthogonal, in particular they have only one point in
> common." ( p. 83)

You can also find similar stuff in Manning's book, The Geometry of Four 
Dimensions.  I have it as a Dover paperback that I bought in the 
fifties or sixties, but nowadays it seems to be available as a free 


-- hendrik

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