Welcome on my home page !
la version francaise de tout ca se trouve
ICI
My name is
Eric Chopin and I've been
a Researcher in Theoretical Physics (elementary particles) and
for 2 years a maths teacher in Grenoble (France). Now I work as a software developer since
sept. 2000 and more specifically in the IT department of a company based in Geneva.


Realizations and interests: 

My research interests include:
 Explicitely gauge invariant reformulation for gauge theories.
 Interacting asymptotic states.
 Nonlinear gauges and gauge invariant calculation of scattering amplitudes.
 The concept of "Canonical proof",
which consists in writing the proof of a theorem without using
any arbitrary element inside (for instance an arbitrary Cartan
Subalgebra for the classification of semisimple Lie algebras), and respecting symmetries.
That is to say, a proof
which respects the symmetries that exists in the hypothesis and the conclusion.
I conjecture that for any proovable theorem, which does not require the axiom of choice
(nor weaker versions of this axiom), and that has at least one symmetry that is valid
among the hypothesis and the conclusion, there exists a canonical proof.
20200419 Covid19 (SRASCov2): My tutorial to make a very cheap and recyclable mask for Covid19 protection!
List of my scientific publications
My math lectures (in french)  LaTeX4Web: my LaTeX to HTML converter
An interesting math problem with one open question ...
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BE AWARE ABOUT INTERNET HOAXES
 If you want to see the danger posed by sects, click for instance on
SCIENTOLOGY
 You will find
HERE
the report to the french parliament about sects (412kb). The
is in progress (still far from
being completed.... :( ) .
More reports are available on the site of the
french parliament.
 A
list of sects extracted from the report of the
french parliament.

HOMEOPATHY IS DANGEROUS!!! It has never been
proved efficient yet, although some homeopathic
products are reimbursed by the french Social Security!
If you eat the whole content of one tube at 12CH, then you may
eat only one active molecule. If the dilution is more important
(say 15CH), then you must eat one million tubes to have a
chance to eat only one active molecule. Imagine
how many tubes you'd have to eat at 20CH or 40CH
dilutions!!! However, homeopathy claims that 20CH or 40CH
are more efficient than 12CH!!!!
 The Nizkor project is a gathering of information about
what happened during World War II and highlights the
mystification done by revisionnists:
Nizkor Project.
The aim of this project is to fight against the propaganda
of NeoNazi groups on internet.
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Just for fun
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Links
 MATHS/PHYSICS :Click here to get some
links onto major sources of math/phys information (math/phy. bulletin board, CERN, ...)
 COMPUTING : Discover the LINUX
operating system, which may become a challenger for Windows in the future.
 TEXT EDITING : Discover
LaTeX (MikTeX distribution),
probably the best software for writing mathematics or physics documents. The link concerns one
of the numerous free software distributions available to format publications using LaTeX.
 SOFTWARE DEVELOPMENT : developer.com,
Codeguru.com,
W3C, the reference for web development
 PARTICLE PHYSICS : The CERN
is an international laboratory for particle physics, located in Geneva.
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Last update : 21/04/2020