在此基础之上，证明了方程的解集构成L的凸子格。
Based on the discussions, it was proved that the solution sets of the equations are convex sublattices of l.
但若故障支路形成回路或割集时，则仍需要解一组非线性方程，不过它的变量个数已大大减少。
But if there have some loops or cut sets between these fault branches, solving a set of nonlinear equations is also necessary, though the number of variables is much decreased.
由于集值算子在现代数学的广泛应用，本文还研讨了关于集值算子方程解的存在性；
Due to the wide applications of setvalued operators in modern mathematics, the solvability of the setvalued operator equations are studied.
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