Unlike linear PDEs, with non-linear PDEs the principle of superposition (which states that linear combination of solutions of equation is again the solution of this equation) does not hold in general case. Example:
"u_{x} +u^2 u_y=0" (1)
One solutions of this PDE is "u_1 = \\frac{-1+\\sqrt{1+4xy}}{2x}" . However, the function "u =cu_1" does not solve the same PDE unless "c = 0, \\pm1".
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