%0 Journal Article %A Serena Dipierro %A Ovidiu Savin %A Enrico Valdinoci %T All functions are locally $s$-harmonic up to a small error %J Journal of the European Mathematical Society %D 2017 %P 957-966 %V 19 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4171/jems/684/ %R 10.4171/jems/684 %F JEMS_2017_19_4_a0