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  • $\begingroup$ If you are comparing functions on different meshes, you want to use the form that includes $N$ or $\Delta x$. $\endgroup$
    – Bill Barth
    Commented May 26, 2015 at 1:29
  • $\begingroup$ @BillBarth Yes, I thought that was clear. Perhaps I should (or you can) edit the answer to make it more explicit? $\endgroup$ Commented May 26, 2015 at 1:50
  • $\begingroup$ Ok, as I thought thanks. Therefore, it s not true that norm L2 should be always smaller than norm L1 as pointed in the math.stackexchange link. That was only for the vectorial unscaled norm. $\endgroup$
    – Millemila
    Commented May 26, 2015 at 14:49