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Martel's research deals with partial differential equations from mathematical physics, especially [[soliton]]s. He has collaborated extensiv ...nd the director of the [[Centre de mathématiques Laurent-Schwartz]] (CMLS) from 2012 to 2017. Since 2012 he is a professor at École Polytechnique<ref name= ...

...of Nations|Commonwealth English]]) is a machine that vertically transports people or freight between levels. They are typically powered by [[electric motors] ...rom later periods mention elevators as cabs on a [[hemp]] rope, powered by people or animals. ...

[[Light]] (ultimately from [[Proto-Indo-European language|Proto-Indo-European]] ''[[wiktionary:Reconst ...ter or lesser extent the light that strikes them, which affects the color, from white (maximum reflection) to black (maximum absorption).<ref name=":1" /> ...