📜 Theorem, law or theory

Wave equation

Ecuación de onda

Date
1746 · confidence medium
Place
Paris, France
Credited to
Jean le Rond d'Alembert
Field
Cosmos & Earth

⚠️ Disputed: the sources disagree.

What was discovered

D'Alembert derives, from the problem of the vibrating string, the differential equation describing how waves propagate through space and time, along with his method of solution.

The physical interpretation of d'Alembert's solutions sparked a long controversy with Euler and Daniel Bernoulli over which functions could represent a wave.

What it led to

  • Mathematical physics of sound, light and water waves
  • Partial differential equations as a general tool in physics
  • Debate with Euler and Daniel Bernoulli over the nature of the solution
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Sources✓ verified 2026-09-25