[racket] Query for Gregory Woodhouse

On Mon, Apr 18, 2011 at 09:17:09AM +0100, Paul Ellis wrote:
>  
> 
> Dear  Gregory Woodhouse
> 
>  
> 
> Unrelated to Racket - I'm interested in the Geometry of 2 Complex
> Dimensions ("G2CDs") and came across your 2006 post: 

Somewhere I have a hand-written manuscript my father wrote in the late 
40's in Dutch -- a course on two-dimensional analytic projective 
geometry.  I believe somewhere in there he mentions using complex 
numbers as coordinates and having imaginary points -- this in the 
section on poles and polars.

He aimed it at those senior high-school students that were streamed into 
a mathematical/scientific direction -- it's at a rather higher level 
than high schools here in Canada.

I don't think he does spinors at all.

Is this of any interest?

I've been planning to scan it and contribute it to the Dutch wikibooks, 
hoping to crowdsource the transcription into machine-readable format.
If you're interested, it will gove me an incentive to hurry this along a 
bit.

-- hendrik

> 
>  
> 
> 
> [plt-scheme] 3rd-8th Grade
> 
> 
> Gregory Woodhouse gregory.woodhouse at sbcglobal.net
> <mailto:users%40racket-lang.org?Subject=Re:%20Re%3A%20%5Bplt-scheme%5D%2
> 03rd-8th%20Grade&In-Reply-To=%3CC2FB68FC-173F-486D-89BC-C805CDEC43C2%40s
> bcglobal.net%3E> 
> Mon Mar 20 08:51:15 EST 2006
> 
>  
> 
> As it appears that you know something about the G2CDs, would you be able
> to point me towards any fairly elementary book/article that discusses
> it?
> 
>  
> 
> I'm an ex-chemist (but not a mathematician) trying to obtain some
> intuitive insight into spinors, and came across Bruce Schumm's "Deep
> Down Things"  (a popular level explanation of gauge theory) in which he
> starts discussing rotations in 2CDs. Rather than limiting it to the
> usual discussion of the Lie group SU(2), he does start to explain it in
> a bit more detail, and I'd very much like to pursue this, but he gives
> no references. I'm well aware of the common references to spinors,
> quaternions, Clifford algebras, and geometric algebra, but with one very
> limited exception, haven't found any description, at the level of
> coordinates etc.,  of the type I seek.
> 
>  
> 
> I would be most grateful for any constructive advice  
> 
>  
> 
> Paul Ellis
> 
> _________________________________
> 
> Paul G. Ellis (Dr) | Teaching & Research Co-ordinator | Management
> Science & Operations
> 
> London Business School | UK |  Email pellis at london.edu
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