The paper “PyFR: An open source framework for solving advection–diffusion type problems on streaming architectures using the flux” says that：
To keep the codebase compact PyFR makes extensive use of symbolic manipulation via SymPy [16], which brings computer algebra facilities similar to those found in Maple and Mathematica to Python. SymPy has built-in support for most common polynomials and can readily evaluate such expressions to arbitrary precision
I want to know where is SymPy used in source code.