- any differential equation that describes the propagation of waves or other disturbances in a medium.
- any of the fundamental equations of quantum mechanics whose solutions are possible wave functions of a particle.
- a partial differential equation describing wave motion. It has the form ∇²φ = (1/ c ²) × (∂²φ/∂ t ²), where ∇² is the Laplace operator, t the time, c the speed of propagation, and φ is a function characterizing the displacement of the wave
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