heat_op            78 src/secOrd_op_linearHeat.cpp   Linear_heat_op heat_op;
heat_op            81 src/secOrd_op_linearHeat.cpp     : heat_op {p, gt}, heat_solver {heat_op, p.eps(), p.eps()}
heat_op           106 src/secOrd_op_linearHeat.cpp   d_ptr -> heat_op.mass_matrix(fef);
heat_op           112 src/secOrd_op_linearHeat.cpp   d_ptr -> heat_op.mass_matrix(rhs_ref, lhs_ref);