Question: how to instruct Maple to get sol. of eq. (y ∂x-x ∂y+w ∂z-z ∂w)f(x,y,z,w)=0

Hello,

how could I force Maple to solve this pde

pdsolve(y*(diff(f(x, y, z, w), x))-x*(diff(f(x, y, z, w), y))+w*(diff(f(x, y, z, w), z))-z*(diff(f(x, y, z, w), w)) = 0)

When I hit enter, it happens nothing.

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