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)`
Output: $$pdsolve(\frac{dy}{dt} +y\ (\frac{dy}{dx} +\frac{dy}{du} +\frac{dy}{dv} )=f)== pdsolve(-f+\frac{d}{dx} y(x)\ y,y)$$
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