[理工] [向量]
Solve the following partial differential equation
d^2u + d^2u + d^2u
---- ---- ---- =0 for 0<=x<=a, 0<=y<=b and 0<=z<=c
dx^2 dy^2 dz^2
with the boundary conditions
u(0,y,z)=0 , u(a,y,z)=0 , u(z,0,z)=0,
u(x,b,z)=0 , u(x,y,0)=0 , u(x,y,c)=f(x,y)
where a , b and c are constants
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