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本文用离散泛函分析方法证明了带对流项的渗流型方程的隐格式差分解的收敛性，同时得到微分方程弱解的存在性
In this paper, the discrete functional analysis method is used to prove the convergence of the implicit difference solution of the seepage equation with convection term, and the existence of the weak solution to the differential equation