Tricomiy Uxx +uyy=0的类型是:
Tricomiy Uxx +uyy=0的类型是:
设函数u(x,y)的傅里叶变换为U(w,t),则方程ut= a2 Uxx的傅里叶变换为dU/dt=-a2w2U
设函数u(x,y)的傅里叶变换为U(w,t),则方程ut= a2 Uxx的傅里叶变换为dU/dt=-a2w2U
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Tricomiy Uxx +uyy=0的类型是:
设函数u(x,y)的傅里叶变换为U(w,t),则方程ut= a2 Uxx的傅里叶变换为dU/dt=-a2w2U