Hi bvenus, the book was written in French. Original version.
Has been translated in English not by me obviously !!!!LOL
In Canada I live in Québec which as you know is a French Province ! ......My English is terrible I know, but my French is very good. I am Italian from Milan .
My husband made the systems he was a mathematician, he died and from time to time I like to offer a copy in his memory as a friendly gesture. Nothing more !
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