#include <triqs/gfs.hpp>
using namespace triqs::gfs;

int main() {
 double tmin = 0, tmax = 10; // the time interval
 double beta = 1;
 int n_times = 100; // we will have 100 pointspoints
 auto g = gf<cartesian_product<retime, imtime>, tensor_valued<3>>{{{tmin, tmax, n_times}, {beta, Fermion, n_times}}, {2, 2, 2}};
}