S: the process to get the solution of equation.
生：求方程的解的过程叫做解方程。
Methods Build up differential equation under the circumstance of the market no arbitrage. Analyze and work out the solution of equation.
方法在市场无套利条件下建立随机微分方程，运用鞅论、随机分析的方法分析并求解方程。
In order to further improve the numerical stability of solution of equation, the orthogonal transformation technique based on PMU is used to solve the problem of state estimation.
为了进一步改善求解方程的数值稳定性，利用正交变换技术来求解状态估计问题。
In order to further improve the numerical stability of solution of equation, the orthogonal transformation technique based on PMU is used to solve the problem of state estimation.
为了进一步改善求解方程的数值稳定性，利用正交变换技术来求解状态估计问题。
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