type t =
{
  elec_num : int                     ; (** Number of electrons *)
  mo_basis : MOBasis.t               ; (** MO basis on which the space is built *)
  mo_class : MOClass.t               ; (** CI Classes of the MOs *)
  spindets : Spindeterminant.t array ; (** Spin-determinants belonging to the space *)
}


val fci_of_mo_basis : ?frozen_core:bool -> MOBasis.t -> int -> t
(** Create a space of all possible ways to put [n_elec] electrons in the [Active] MOs.
    All other MOs are untouched.
*)


(** {2 Printing} *)

val pp_spindet_space : Format.formatter -> t -> unit