Title: Differential-operator representations of Weyl group and singular vectors,
Abstract: Given a suitable ordering of the positive root system associated with a
semisimple Lie algebra, there exists a natural correspondence between Verma
modules and related polynomial algebras. With this, the Lie algebra action on a
Verma module can be interpreted as a differential operator action on
polynomials, and thus on the corresponding truncated formal power series. We
prove that the space of truncated formal power series is a
differential-operator representation of the Weyl group $W$. We also introduce a
system of partial differential equations to investigate singular vectors in the
Verma module. It is shown that the solution space of the system in the space of
truncated formal power series is the span of $\{w(1)\ |\ w\in W\}$. Those
$w(1)$ that are polynomials correspond to singular vectors in the Verma module.
This elementary approach by partial differential equations also gives a new
proof of the well-known BGG-Verma Theorem.