README.md

reference/ — pointer to upstream Mathematica AMFlow

This C++ project is a reimplementation of the algorithms in the Mathematica package AMFlow by Xiao Liu and Yan-Qing Ma:

• Upstream repository: https://gitlab.com/multiloop-pku/amflow
• Algorithm paper: Liu & Ma, AMFlow: A Mathematica package for Feynman integrals computation via auxiliary mass flow, Comput. Phys. Commun. 283 (2023) 108565, doi:10.1016/j.cpc.2022.108565.

The upstream Mathematica source is not vendored in this repository. Documentation and code comments in this repo refer to symbols and line numbers in the upstream files (AMFlow.m, diffeq_solver/DESolver.m, ibp_interface/Kira/interface.m); to follow those references and to regenerate Mathematica reference data with tools/bench/*.wl or tools/math_ref/*.wl, you need a local copy of upstream AMFlow at this path:

reference/amflow-master/

How to populate reference/amflow-master/

Pick one of the following — both are fine for development.

Option 1 — clone upstream into this repo (gitignored)

git clone https://gitlab.com/multiloop-pku/amflow.git reference/amflow-master

reference/amflow-master/ is in .gitignore, so the cloned tree will not be tracked by this repository.

Option 2 — symlink to an existing clone elsewhere

git clone https://gitlab.com/multiloop-pku/amflow.git ~/src/amflow
ln -s ~/src/amflow reference/amflow-master

The symlink itself is gitignored.

Notes

• The line numbers cited in this project's documentation track the upstream master branch at the time of the v1.0.0 release. If upstream has moved on, search by symbol name rather than by line number.
• All algorithmic credit belongs to the AMFlow authors above; this repository contributes only the C++17 reimplementation and a numerical-parity test/benchmark harness.