{"title":"L'algèbre sans les fictions des racines : Kronecker et la théorie des caractéristiques dans les \"Vorlesungen über die algebraischen Gleichungen\"","authors":"Cédric VERGNERIE","doi":"10.24033/rhm.223","DOIUrl":"https://doi.org/10.24033/rhm.223","url":null,"abstract":"Algebra without “all the fictions about the roots of equations”: the theory of characteristics in Kronecker’s Vorlesungen über die algebraischen Gleichungen) For the better part of the second half of the nineteenth century, Leopold Kronecker gave a course on the theory of algebraic equations, which represents his Algebra lectures. In this Vorlesungen über die Theorie der algebraischen Gleichungen, he asked Algebra to be “as far as possible independent from all the fictions about the roots of equations”. We will show how Kronecker, in the context of the theory of characteristics—a generalization of Sturm’s theorem—, dealt with the concept of continuity and how, in his practice, the very notion of root is questioned. Texte reçu le 2 juillet 2018, accepté le 3 novembre 2018, révisé le 26 décembre 2018. C. Vergnerie, Université Paris Diderot – CNRS, Laboratoire SPHERE, UMR 7219, bâtiment Condorcet, case 7093, 5 rue Thomas Mann, 75205 Paris cedex 13, France. Courrier électronique : cedric.vergnerie@gmail.com Classification mathématique par sujets (2000) : 01A55. Mots clefs : Kronecker, Sturm, Gauss, Équation, Théorème fondamental de l’algèbre, histoire de l’algèbre, théorie des caractéristiques, continuité, racines.","PeriodicalId":183845,"journal":{"name":"Revue d histoire des mathé matiques","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122084781","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Une analyse génétique de l'\"Introduction à l'analyse des lignes courbes algébriques\" de Gabriel Cramer (1750)","authors":"Thierry JOFFREDO","doi":"10.24033/rhm.226","DOIUrl":"https://doi.org/10.24033/rhm.226","url":null,"abstract":"Gabriel Cramer (1704-1752) publie a Geneve en 1750 son Introduction a l'analyse des lignes courbes algebriques, un ouvrage important pour l'histoire de la geometrie et de l'algebre, comme le demontre l'historiographie sur le sujet. Dans cet article, nous ne nous interesserons pas directement aux contenus de cet ouvrage, mais plutot a sa genese et aux grandes etapes de son ecriture par le Genevois, qui a concu ce projet editorial dix ans avant sa publication. Nous nous appuierons pour cela sur les methodes de la critique genetique, a partir des sources variees dont nous disposons pour ce texte. Nous presenterons et analyserons sous cet angle les manuscrits inedits de l'Introduction aujourd'hui conserves a la Bibliotheque de l'universite de Geneve, et degagerons du dossier genetique forme par ces manuscrits et la correspondance de Gabriel Cramer les indices materiels nous permettant de reconstituer les processus de redaction et de restituer les dynamiques d'ecriture de l'auteur durant la decennie qui precede la publication de son ouvrage.","PeriodicalId":183845,"journal":{"name":"Revue d histoire des mathé matiques","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121319749","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A plurality of (non)visualizations: Branch points and branch curves at the turn of the 19th century","authors":"M. Friedman","doi":"10.24033/rhm.224","DOIUrl":"https://doi.org/10.24033/rhm.224","url":null,"abstract":"— This article deals with the different ways branch points and branch curves were visualized at the turn of the 19th century. On the one hand, for branch points of complex curves one finds an abundance of visualization techniques employed. German mathematicians such as Felix Klein or Walther von Dyck were the main promoters of these numerous forms of visualization, which appeared either as two-dimensional illustrations or three-dimensional material models. This plurality of visualization techniques, however, also resulted in inadequate images that aimed to show the varied ways branch points could possibly be represented. For branch (and ramification) curves of complex surfaces, on the other hand, there were hardly any representations. When the Italian school of algebraic geometry studied branch curves systematically only partial illustrations can be seen, and branch curves were generally made “invisible”. The plurality of visualizations shifted into various forms of non-visualization. This can be seen in the different ways visualization techniques disappeared. Texte reçu le 9 novembre 2017, accepté le 16 juillet 2018, révisé le 15 août 2018. M. Friedman, Humboldt University, Cluster of Excellence Matters of Activity. Image Space Material, Sophienstr. 22a, Berlin 10178, Germany. Courrier électronique : michael.friedman@hu-berlin.de 2000 Mathematics Subject Classification : 01A55, 01A60, 14–03, 14H30, 14J99.","PeriodicalId":183845,"journal":{"name":"Revue d histoire des mathé matiques","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128108430","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}