Input:
pdsolve(ds(y,x,2)--ds(y,u,2)--ds(y,v,2)=0)
Write:
`pdsolve(ds(y,x,2)--ds(y,u,2)--ds(y,v,2)=0)`
Compute:
$$pdsolve(\frac{d^{{2}}y}{dx^{{2}}}+\frac{d^{{2}}y}{du^{{2}}}+\frac{d^{{2}}y}{dv^{{2}}}=0)$$
Output:
$$pdsolve(\frac{d^{{2}}y}{dx^{{2}}}+\frac{d^{{2}}y}{du^{{2}}}+\frac{d^{{2}}y}{dv^{{2}}}=0)== C_1+C_2\ ({u}^{2}-\frac{1}{2}\ {v}^{2}-\frac{1}{2}\ {x}^{2})$$
Result: $$C_1+C_2\ ({u}^{2}-\frac{1}{2}\ {v}^{2}-\frac{1}{2}\ {x}^{2})$$
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