{"id":632,"date":"2019-02-15T07:53:08","date_gmt":"2019-02-15T06:53:08","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/lehning\/?p=632"},"modified":"2019-03-09T08:48:57","modified_gmt":"2019-03-09T07:48:57","slug":"les-carnets-a-spirales-sont-ils-a-helices","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/","title":{"rendered":"Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?"},"content":{"rendered":"

En grec ancien, speirao <\/em>signifiait \u00ab\u00a0enrouler\u00a0\u00bb, de bandelettes en particulier, mot qui rapprochait les langes des enfants de ceux des momies. Notre mot \u00ab\u00a0spirale\u00a0\u00bb en d\u00e9rive\u2026 pourtant, de ce temps, \u00ab\u00a0spirale\u00a0\u00bb se disait \u00e9liks<\/em>\u00a0 \u2026 qui a donn\u00e9 notre \u00ab\u00a0h\u00e9lice\u00a0\u00bb. Les deux mots viennent donc de l\u2019id\u00e9e d\u2019enrouler, mais les spirales sont tomb\u00e9es dans le monde \u00e0 deux dimensions tandis que les h\u00e9lices se sont \u00e9lev\u00e9es dans celui \u00e0 trois dimensions. H\u00e9las, les spirales de la violence comme celles du ch\u00f4mage, ou d\u2019autres encore, nous enfoncent sans cesse et sont donc plut\u00f4t des h\u00e9lices que des spirales.<\/p>\n

De fa\u00e7on plus gaie, nous devons \u00e0 cette confusion premi\u00e8re, entre h\u00e9lice et spirale, les carnets \u00e0 spirales, si chers \u00e0 William Sheller, qui pourtant sont \u00e0 h\u00e9lices, pas celles des avions, celles plus prosa\u00efques des math\u00e9matiques.<\/p>\n

Les h\u00e9lices, des math\u00e9matiques aux bateaux et aux avions<\/h2>\n

Quel rapport entre les h\u00e9lices des math\u00e9maticiens et celles des avionneurs\u00a0? A priori<\/em>, aucun. Pourtant, le premier engin destin\u00e9 \u00e0 mouvoir un liquide \u00e9tait la vis d\u2019Archim\u00e8de, qui est bien construite sur une h\u00e9lice circulaire. Cette origine explique l\u2019utilisation du terme \u00ab\u00a0h\u00e9lice\u00a0\u00bb pour tous les engins destin\u00e9s \u00e0 mouvoir un fluide, ou \u00e0 mouvoir un objet dans un fluide.<\/p>\n

\"\"
La vis d’Archim\u00e8de est une h\u00e9lice, dans le sens des math\u00e9matiques comme de la m\u00e9canique des fluides.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

En grec ancien, speirao signifiait \u00ab\u00a0enrouler\u00a0\u00bb, de bandelettes en particulier, mot qui rapprochait les langes des enfants de ceux des momies. Notre mot \u00ab\u00a0spirale\u00a0\u00bb en d\u00e9rive\u2026 pourtant, de ce temps, \u00ab\u00a0spirale\u00a0\u00bb se disait \u00e9liks\u00a0 \u2026 qui a donn\u00e9 notre \u00ab\u00a0h\u00e9lice\u00a0\u00bb. Les deux mots viennent donc de l\u2019id\u00e9e d\u2019enrouler, mais les spirales sont tomb\u00e9es dans le … Continuer la lecture de Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":12,"featured_media":634,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[112,6,29],"tags":[],"class_list":["post-632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-humour","category-litterature","category-maths-2"],"yoast_head":"\nLes carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?, par Herv\u00e9 Lehning<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?, par Herv\u00e9 Lehning\" \/>\n<meta property=\"og:description\" content=\"En grec ancien, speirao signifiait \u00ab\u00a0enrouler\u00a0\u00bb, de bandelettes en particulier, mot qui rapprochait les langes des enfants de ceux des momies. Notre mot \u00ab\u00a0spirale\u00a0\u00bb en d\u00e9rive\u2026 pourtant, de ce temps, \u00ab\u00a0spirale\u00a0\u00bb se disait \u00e9liks\u00a0 \u2026 qui a donn\u00e9 notre \u00ab\u00a0h\u00e9lice\u00a0\u00bb. Les deux mots viennent donc de l\u2019id\u00e9e d\u2019enrouler, mais les spirales sont tomb\u00e9es dans le … Continuer la lecture de Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ? →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/\" \/>\n<meta property=\"og:site_name\" content=\"MATH'MONDE, le blog d'Herv\u00e9 LEHNING, agr\u00e9g\u00e9 de math\u00e9matiques\" \/>\n<meta property=\"article:published_time\" content=\"2019-02-15T06:53:08+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2019-03-09T07:48:57+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2019\/02\/CarnetsSpirales2.png\" \/>\n\t<meta property=\"og:image:width\" content=\"472\" \/>\n\t<meta property=\"og:image:height\" content=\"351\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/\",\"name\":\"Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?, par Herv\u00e9 Lehning\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2019\/02\/CarnetsSpirales2.png\",\"datePublished\":\"2019-02-15T06:53:08+00:00\",\"dateModified\":\"2019-03-09T07:48:57+00:00\",\"author\":{\"@id\":\"\"},\"breadcrumb\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/#breadcrumb\"},\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2019\/02\/CarnetsSpirales2.png\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/lehning\/wp-content\/uploads\/sites\/13\/2019\/02\/CarnetsSpirales2.png\",\"width\":472,\"height\":351},{\"@type\":\"BreadcrumbList\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/2019\/02\/15\/les-carnets-a-spirales-sont-ils-a-helices\/#breadcrumb\",\"itemListElement\":[{\"@type\":\"ListItem\",\"position\":1,\"name\":\"Accueil\",\"item\":\"https:\/\/blogs.futura-sciences.com\/lehning\/\"},{\"@type\":\"ListItem\",\"position\":2,\"name\":\"Les carnets \u00e0 spirales sont-ils \u00e0 h\u00e9lices ?\"}]},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/lehning\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/lehning\/\",\"name\":\"MATH'MONDE, le blog d'Herv\u00e9 LEHNING, agr\u00e9g\u00e9 de math\u00e9matiques\",\"description\":\"Comment comprendre le monde moderne sans culture math\u00e9matique ? 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