Wave equation
Even dimensions

Assume n ≥ 2 is an even integer and g ∈ C (R), h ∈ C (R), for m = (n + 2)/2. Let γ = 2 × 4 × ⋯ × n and let

u (x, t) = 1 γ n {\displaystyle u(x,t)={\frac {1}{\gamma _{n}}}\left}

then
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