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 here. There is also an example Mathematica notebook to explain how to use the package. 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).