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.

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Realizations and interests:

My research interests include:

• Explicitely gauge invariant reformulation for gauge theories.
• Interacting asymptotic states.
• Non-linear 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 semi-simple 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 (SRAS-Cov-2): 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 ... Back to menu

Be careful to what you are looking on the web...

• 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 english translation 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 were reimbursed by the french Social Security until recently!
  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 Neo-Nazi groups on internet.
   

• A funny enigma: the 40 monks! A real brain teaser!
• International Festival of Animation Film in Annecy (in May).
• Paragliding. The paragliding info server of the Saleve school.
• Rockets (It was my main hobby when I was a teenager, and I've built several ones during 6 years).

• 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.
    Check also my GitHub profile
   
• TEXT EDITING with LaTeX: 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.

Last update : 21/04/2020