Input:
pdsolve(ds(y,t)=a*(ds(y,x,2)--ds(y,u,2)--ds(y,v,2)))
Write:
`pdsolve(ds(y,t)=a*(ds(y,x,2)--ds(y,u,2)--ds(y,v,2)))`
Compute:
$$pdsolve(\frac{dy}{dt} =a\ (\frac{d^{{2}}y}{dx^{{2}}}+\frac{d^{{2}}y}{du^{{2}}}+\frac{d^{{2}}y}{dv^{{2}}}))$$
Output:
$$pdsolve(\frac{dy}{dt} =a\ (\frac{d^{{2}}y}{dx^{{2}}}+\frac{d^{{2}}y}{du^{{2}}}+\frac{d^{{2}}y}{dv^{{2}}}))== C_1+C_2\ exp((-3)\ a\ t)\ sin(u)\ sin(v)\ sin(x)$$
Result: $$C_1+C_2\ exp((-3)\ a\ t)\ sin(u)\ sin(v)\ sin(x)$$
zoom graph by mouse wheel.