Hi there! I'm attempting to create a program to implement a time-dependant problem using a DG method and in calculating the exact error I need to calculate the H^1 semi-norm on each cell. I was wondering whether integrate_difference using the H^1 semi-norm can do this for DG - the reason I ask is because while the rest of my error goes to zero as I refine the mesh-size and the time-step, this portion of the error goes to infinity if I use integrate_difference, which is clearly not correct. Thanks,
Stephen
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