HI， everyone!
I have a question, how to solve the maximum norm of U0 on a mesh cell.
Thank you in advance for your reply！
Shasha
#############################
from ngsolve import *
import pickle
import netgen.gui
i=10
mesh = ngm.MakeStructured2DMesh(quads=False, nx =i,ny = i)
exact_u =CoefficientFunction( ( sin(2*pi*x)*sin(2*pi*y), cos(2*pi*x)*cos(2*pi*y) ))
U0=exact_u
