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# Copyright (c) 2005-2006 Anders Logg (logg@tti-c.org) # Licensed under the GNU GPL Version 2 # # First added: 2005-06-05 # Last changed: 2006-03-28 # # The bilinear form for a stiffness matrix (Poisson). element = FiniteElement("Lagrange", "triangle", 1) v = TestFunction(element) U = TrialFunction(element) c = Constant() a = c*dot(grad(v), grad(U))*dx |