  Let X a proper smooth curve over the field of complex numbers. Localization
of the Heisenberg algebra gives the algebra of global sections of the ring of
differential operators on the Jacobian J of X. It seems natural to ask for same
kind of relations over a characteristic p > 0 field replacing the Heisenberg
algebra by its entire form. We propose a conjecture about the constuction of an
arrow between the two objects when X is an elliptic curve.
