Maxima by Example: Ch. 7, 8, 9, 10, and 11 posted

On Wed, Apr 29, 2009 at 09:43:08PM -0400, Stavros Macrakis wrote:
> Tensor calculus would be interesting in a Maxima book, but I doubt we want
> to hitch our wagon to Myron Evans.

The question is not whether or not to 'hitch our wagon' to Myron Evans,
but whether Evans' ECE theory correctly predicts physical phenomena not
explainable by Maxwell-Heaviside or standard GR theory. To the best of
my knowledge, noone has refuted any data explained by him in terms of
ECE. I have definitely got the impression that few, if any, people
reading his papers understand the mathematics of differential geometry
upon which ECE is based.
 
> I am certainly not competent to judge his work myself, but as far as I can
> tell, Evans' ECE theory has not been accepted by any serious physicist.  The
> Wikipedia article Eistein-Cartan-Evans theory has some interesting
> citations, including http://www.springerlink.com/content/l1008h127565m362,
> an editorial in a journal where Evans published some of his results which
> reports their refutation.

Evans has stated that in GR a non-zero curvature *requires* a non-zero
torsion and Evans has published a proof based upon a symbolic derivation
of torsion from curvature using Maxima. If that assertion can be
verified by an independent third party, then Evans' work destroys the
bulk of 'standard' GR. I am interested in a verification or
falsification of that assertion using any symbolic math package.
I bought Maple 12 with that idea in mind. I still am pursuing the
same goal with Maxima, but much more low key for lack of hard copy
documentation. I am having increasing vision problems which make
reading books much easier than reading CRT screens.
 
> It is also odd that Evans' Web site, aias.us, talks so much about
> Evans' UK government honors, his nominations (nominations!) to
> knighthood, his coat of arms, etc.
 
Focus on the accuracy of Evans' work. Forget about Wikipedia where Evans is
concerned. The Wiki entry about him and his work has been completely removed.
 
> On Wed, Apr 29, 2009 at 8:49 PM, Dave Feustel <dfeustel at mindspring.com>wrote:
> 
> > On Wed, Apr 29, 2009 at 04:48:22PM -0700, Edwin Woollett wrote:
> > > The old chapter seven has been split into 7 plus 10 for ease of
> > maintenance.
> > > However, all (7 - 11) have been updated with a fancy verbatim environment
> > > plus the latex color package to make the maxima code stand out better.
> > > (ch. 1 - 6 remain to be updated with this style.)
> > >
> > > New material is:
> > > ch. 8: numerical integration,
> > > ch. 9: bigfloats and arbitrary precision quadrature,
> > > ch. 11 fast fourier transforms
> >
> > Have you thought about including a chapter on tensor calculus and
> > differential geometry with reference to General Relativity? Dr. Myron
> > Evans writes that he has used maxima to prove a fundamental error in
> > Einstein's General Relativity - namely that torsion cannot be zero when
> > curvature in non-zero. The calculations are available in the papers
> > section of his website, aias.us. The implications for general relativity
> > of non-zero torsion appear to be wide-ranging and Dr. Evans has been
> > writing a lot of papers investigating those implications.
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