Let
be a compact Riemannian manifold of dimension
with nonnegative scalar curvature and semipositive Q-curvature. Assume
is not
conformally equivalent to the standard sphere. If a prescribed positive smooth function
is flat
up to
order at some maximum point, there exists a conformal metric
such
that
.
This is a natural higher order version of the result of Escobar and Schoen
(1986).