Which in this case was Taylor's approximation, if I remember right.

在这个情况下是泰勒近似，如果我没记错的话。

youdao

According to the dual theory, the dual programming was used to map the original problem exactly and the second approximation of the dual problem was set up by Taylor's expansion.

根据对偶理论，应用对偶规划精确映射原问题，再按泰勒展式建立对偶问题的二阶近似。

youdao