Jean Le Rond und French Person-Info 

( Ich bin Jean Le Rond)
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Constrained or Unconstrained, That Is the Equation | USC News

news.usc.edu
When writing equations to describe motion, mathematicians have long followed a principle named for the Frenchman who formulated it in 1743, Jean le Rond D' Alembert. It assumes that the forces of constraint do no work. When French physicist Joseph Louis Lagrange wrote the classic Mechanique ...
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