triqs::hilbert_space::fundamental_operator_set
#include <triqs/hilbert_space/fundamental_operator_set.hpp>
class fundamental_operator_set
This class represents an ordered set of indices of the canonical operators (see [[many_body_operator]]) used to build the Fock states. Every element of the set is an arbitrarily long sequence of integers/strings (types can be mixed within one sequence). The elements maintain the order they are inserted in