Partial Differential Equations

kingwinner

[note: U_x = ∂U/∂x, U_y = ∂U/∂y]

1) Find the general solution to the PDE:
xy (U_x) + y^2 (U_y) - y u = y - x

2) Find the general solution to the PDE and solve the initial value problem:
y^2 (U_x) + x^2 (U_y) = 2 y^2, initial condition u(x, y) = -2y on y^3 = x^3 - 2

唔識點做呢2題, pls help
thx


[edit: 我計到la, 唔洗回了]

[ 本帖最後由 kingwinner 於 09-9-25 03:06 AM 編輯 ]