DoFun 3.0: Functional equations in Mathematica

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 restructured for easier maintenance.
Comment: 15 pages, 3 figures; code at https://github.com/markusqh/DoFun; v2: added quick start guide, clarified compatibility with Mathematica versions, agrees with published version