Mathematically, the motion of a fluid is described by the so-called Navier-Stokes equations. In the spirit of Newtonian mechanics, these equations should determine the future motion of the fluid out of its initial state.
The aim of this article is to highlight some previous challenges that were also a stimulus to finding proof for some interesting results. With this pretext, we present three moments in the history of mathematics that were important for the development of new lines of research.
The Poincaré conjecture is a topological problem established in 1904 by the French mathematician Henri Poincaré. It characterises three-dimensional spheres in a very simple way. This problem was directly solved between 2002 and 2003 by Grigori Perelman, and as a consequence of his demonstration of the Thurston geometrisation conjecture.
The Clay Mathematics Institute made a list of seven problems in May 2000; they were called the «millennium problems». Finding their solution has an added incentive: each solver will receive a million dollars as a prize.
Each domain of knowledge has its own language, content and method. They give it character, and whenever a field of knowledge advances, it is thanks to one of them. Language is very important for science, but is not necessarily a priority. Old language can lead
[caption id="attachment_44023" align="alignleft" width="320"] Illustration: Anna Sanchis[/caption]
When we were little, we knew the following by heart: A metre is the distance between two lines marked on a bar of platinum and iridium kept in the Museum of Weights and Measures of Paris.» And we added: