Ward Identities and Anomalies in Pure W_4 Gravity
  W_4 gravity is treated algebraically, represented by a set of transformations on classical fields. The Ward identities of the theory are determined by requiring the algebra to close. The general forms for the anomalies are found by looking for solutions to the Wess-Zumino consistency conditions, and some specific cases are considered. 
Paul Watts (Dublin Institute for Advanced Studies)