This Mathematica code is an accompaniment to the paper: A Transport Equation Approach to Calculations of Hadamard Green Functions and off-diagonal DeWitt Coefficients. It symbolically calculates covariant series expansions of many bi-tensors, including the functions appearing in the Hadamard form of the Green function. Please see the paper for a full description.
The full code is available to download from github or you can dowload the latest release as a gzipped tarball. It is provided as free software under the terms of the GNU General Public License version 2 (or later). If you find this code useful, please cite the paper Phys. Rev. D 84, 104039 (2011).