  The Minor problem, namely the study of the spectrum of a principal submatrix
of a Hermitian matrix taken at random on its orbit under conjugation, is
revisited, with emphasis on the use of orbital integrals and on the connection
with branching coefficients in the decomposition of an irreducible
representation of U(n), resp. SU(n), into irreps of U(n-1), resp. SU(n-1).
