Input:
pdsolve(ds(y,t)--y*(ds(y,x)--ds(y,u)--ds(y,v))=f)
Write:
`pdsolve(ds(y,t)--y*(ds(y,x)--ds(y,u)--ds(y,v))=f)`
Compute:
$$pdsolve(\frac{dy}{dt} +y\ (\frac{dy}{dx} +\frac{dy}{du} +\frac{dy}{dv} )=f)$$
Output:
$$pdsolve(\frac{dy}{dt} +y\ (\frac{dy}{dx} +\frac{dy}{du} +\frac{dy}{dv} )=f)== C_1+f\ (t+C_2\ (u-v)+C_3\ (x-t\ y))$$
Result: $$C_1+f\ (t+C_2\ (u-v)+C_3\ (x-t\ y))$$
zoom graph by mouse wheel.