vs                153 src/brusselator_algo_impl.cpp   vs {bs.data, grid, u.fun},
vs                166 src/brusselator_algo_impl.cpp   vs.brusselator_rhs(X.fun, X.rhs_les);	
vs                172 src/brusselator_algo_impl.cpp   vs.solve(X.rhs_les, X.fun);
vs                216 src/brusselator_algo_impl.h     Vector_solver vs;