Content License: Creative Commons Attribution Non Commercial Share Alike 4.0 International (CC-BY-NC-SA-4.0)Credit must be given to the creatorOnly noncommercial uses of the work are permittedAdaptations must be shared under the same termsDownloadsDownloadnotes-élémentaires.mdThierry ParmentelatNovember 13, 2025the body of notes-élémentaires.md