  AdS space is the universal covering of a hyperboloid. We consider the action
of the deck transformations on a classical string worldsheet in $AdS_5\times
S^5$. We argue that these transformations are generated by an infinite linear
combination of the local conserved charges. We conjecture that a similar
relation holds for the corresponding operators on the field theory side. This
would be a generalization of the recent field theory results showing that the
one loop anomalous dimension is proportional to the Casimir operator in the
representation of the Yangian algebra.
