The mathematical adjoint equation. not the physical adjoint equation, is required for nodal method, but it is rather too difficult to solve the former.
对于节块法，需要的是数学共轭方程，而不是物理共轭方程，但数学共轭方程求解比较困难。
We put forward a decomposing technology of creating the adjoint equation. By creating the 2-d shallow-water equation, we study the mathematical method of creating the adjoint equation.
提出了建立伴随方程的分解技术，通过二维浅水波方程的伴随方程的建立，研究了建立伴随方程的数学方法。
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