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Sep 10, 2017 at 11:57 history edited Joonas Ilmavirta CC BY-SA 3.0
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Jul 28, 2015 at 10:59 comment added Buyang LI Thank you. Yes, in 1D it is true. I mainly concern higher dimensions.
Jul 28, 2015 at 9:41 comment added Joonas Ilmavirta @BuyangLI, I would guess so. In one dimension that is true because simple functions are dense in $L^\infty$, but I don't know if this is true in higher dimensions.
Jul 28, 2015 at 9:30 comment added Buyang LI In a 2D domain, are the functions whose partial derivatives are simple functions dense in $W^{1,\infty}$ ?
Jul 28, 2015 at 9:30 vote accept Buyang LI
Jul 28, 2015 at 8:50 history answered Joonas Ilmavirta CC BY-SA 3.0