Wave equation

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The wave equation in one dimension is:

v-22H/∂t2 - ∂2H/∂x2 = 0

two dimensions:

v-22H/∂t2 - (∂2H/∂x2 + ∂2H/∂y2) = 0

three dimensions:

v-22H/∂t2 - ∇2H = 0

where v is the term that describes the velocity of the wave, and H is the quantity that the wave is propogating through. Note that H can be either a vector (like the electric and magnetic fields) or a scalar (like density or pressure).