Home › Events › PDE, Complex Analysis and Differential Geometry Seminar: Euan Spence - University of Bath, UK PDE, Complex Analysis and Differential Geometry Seminar: Euan Spence - University of Bath, UK Time: Tue Oct 30, 2012, 1:30 pm - 2:30 pm Location: 258 Hurley Hall Title: Is the Helmholtz equation really sign-indefinite? Abstract