heat_solver        79 src/secOrd_op_linearHeat.cpp   Solver heat_solver;
heat_solver        81 src/secOrd_op_linearHeat.cpp     : heat_op {p, gt}, heat_solver {heat_op, p.eps(), p.eps()}
heat_solver       101 src/secOrd_op_linearHeat.cpp   d_ptr -> heat_solver(fef1, fef2);