Abstract
This paper is intended to discuss the problems of solving system of linear operator equations and a kind of nonlinear operator equation A u B u + C u = f . For system of linear operator equations, we obtain a criterion about the existence of solutions. If it has solutions, we get the analytic representation of its minimum norm solution and the structure of its solution space; for nonlinear operator equation A u B u + C u = f , with the help of the discussion on how to solve the system of linear operator equations, the exact solution is given. Besides, we obtain the representation of all its solutions.
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