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Popularity to D'Alembert was brought with the Treatise on dynamics (1743) in which he is described a method of reduce of dynamics of firm bodies to a statics (D'Alembert`s principle).
Also D'Alembert`s formula is known:
Describes the decision of Koshi task for the one-dimensional wave equation
In area t > 0,  < x <  .
With entry conditions  , 
Thus also  and  should be twice continuously differentiable, and function
f (x, t) should be continuous together with the first derivative on x
in half-plane
 < x <
D'Alembert`s formula is received in 1747.
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