  Non-existence of warped product semi-slant submanifolds of Kaehler manifolds
was proved in [17], it is interesting to find their existence. In this paper,
we prove the existence of warped product semi-slant submanifolds of nearly
Kaehler manifolds by a characterization. To this end we obtain an inequality
for the squared norm of second fundamental form in terms of the warping
function and the slant angle. The equality case is also discussed.
