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["Garth N. Wells" <gnw20@xxxxxxxxx>]

I couldn't find in the UFL manual whether or not there is something 
special about 'a' and 'L' denoting bilinear and linear forms, 
respectively, or if this determined by the form compiler?

Either way, it seems that some checks are missing in either UFL or FFC 
since

  element = FiniteElement("Lagrange", triangle, 1)
  v = TestFunction(element)
  u = TrialFunction(element)
  f = Function(element)

  a = inner(grad(v), grad(u))*dx + v*f*dx

doesn't result in an error. I would expect this to give an error.

Garth