The following are personnal papers on various subject. I'll be glad to share with you feedbacks of these writings, and why not, publish them here.

I apologise for my bad english, and if you have remarks, corrections, ideas, links, you must send them to me, as I want these papers to be simple to understand, as complete as possible, and keep correctness.

And, as my natural language is French, my papers might not always be translated.