  We point out that the determinant formula for a parabolic Verma module plays
a key role in the study of (super)conformal field theories and in particular
their (super)conformal blocks. The determinant formula is known from the old
work of Jantzen for bosonic conformal algebras, and we present a conjecture for
superconformal algebras. The application of the formula includes derivation of
the unitary bound and recursion relations for conformal blocks.
