We present version 3.0 of the Mathematica package DoFun for the derivation of functional equations. In this version, the derivation of equations for correlation functions of composite operators was added. In the update, the general workflow was slightly modified taking into account experience with the previous version. In addition, various tools were included to improve the usage experience and the code was partially restructure for easier maintenance.

中文翻译：

---

DoFun 3.0：mathematica 中的函数方程

我们提供 Mathematica 包 DoFun 的 3.0 版，用于推导函数方程。在这个版本中，增加了复合算子相关函数方程的推导。在更新中，考虑到以前版本的经验，对一般工作流程进行了轻微修改。此外，还加入了各种工具来提升使用体验，并对代码进行了部分重构，以便于维护。