Report copyright - 波動方程式 - Hiroshima University...1u 1 +a 2u 2) ∂2u ∂t2 = 2 ∂t2 (a 1u +a 2u 2) =a 1 ∂2 u 1 ∂t2 +a 2 2 2 ∂t2 =c2 ∂2u ∂x2 以下略 u i(x, 0) = f i(x), u i t (x,
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