  In the theory of Lie groups, the irreducibility of a unitary representation
is not preserved in general by restriction to a subgroup. Kirillov's conjecture
says that it is preserved for the groups Gl(n,R) or Gl(n,C) when the subgroup
is the subgroup of matrices leaving invariant a non zero vector. This
conjecture was proved by Barush using a detailed study of nilpotent orbits. In
fact, it is not difficult to see that the conjecture is equivalent to the fact
that some system of partial differential equations has no singular
distributions as solutions. This system of equations is a regular holonomic
D-module and we give a proof of the result by an explicit calculation of the
roots of the b-functions associated to this D-module.
