Version that seems to work: 9-point box stencil and Crank-Nicolson.  Easy.  No Jacobian for now.
Version that seems to work: 9-point box stencil and Crank-Nicolson.  Easy.  No Jacobian for now.

bueler/p4pdes,bueler/p4pdes,bueler/p4pdes,bueler/p4pdes