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.. _triqs__hilbert_space__space_partition__lookup_basis_state:

triqs::hilbert_space::space_partition::lookup_basis_state
=========================================================

*#include <triqs/hilbert_space/space_partition.hpp>*



**Synopsis**

 .. rst-class:: cppsynopsis

       | space_partition::idx_t :red:`lookup_basis_state` (space_partition::idx_t :param:`basis_state`)





Find what invariant subspace a given Fock state belongs to





Parameters
^^^^^^^^^^

 * :param:`basis_state` Index of a basis Fock state


Returns
^^^^^^^

Index of the found invariant subspace