{"product_id":"manuscrit-d-un-developpement-mathematique-par-fourier","title":"Manuscript of a mathematical development by Fourier","description":"\u003cp\u003eJoseph Fourier (1768-1830), Autograph manuscript, incomplete; in brown ink.\u003c\/p\u003e\n\u003cp\u003eQuarto (220 x 175 mm – frame 390 x 350 mm).\u003cbr\u003eManuscript of a mathematical development by Joseph Fourier.\u003c\/p\u003e\n\u003cp\u003eEnd of a manuscript, this is a single page numbered \"14\".\u003cbr\u003eHe explains, for a function, how to calculate the tangent, the normal, the subnormal, etc.\u003c\/p\u003e\n\u003cp\u003e\"Lorsque on a y=f(x), on a pour sous tg, PT=ydx\/dy, pour la sous normale, Pn=ydy\/dx, pour la tangente [...]\".\u003c\/p\u003e\n\u003cp\u003eHe develops the equation of the tangent, that of the normal, then the case where F(x,y)=W=0, in which case \"dy\/dx devient égale à (dw\/dx)\/(dw\/dy), pris en moins, les valeurs précédentes deviennent alors [...]\".\u003cbr\u003eHe concludes: \"on auroit de même les équations de la tangente et de la normale en remplaçant dx\/dy et dy\/dx par les valeurs correspondantes. Soit F(x,y,z)=W=0\".\u003c\/p\u003e\n\u003cp\u003eA rare scientific manuscript by one of the foremost mathematicians of the 19th century, who developed the famous Fourier Series, a fundamental mathematical tool.\u003c\/p\u003e","brand":"Librairie Alexis Noqué","offers":[{"title":"Default Title","offer_id":59464107753797,"sku":"0933","price":2500.0,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0793\/8611\/6421\/files\/0933-fourier-01.jpg?v=1790175267","url":"https:\/\/www.librairie-alexisnoque.fr\/en\/products\/manuscrit-d-un-developpement-mathematique-par-fourier","provider":"Librairie Alexis Noqué","version":"1.0","type":"link"}