%0 Journal Article %A Johann Davidov %T Smoothness of the signed distance function: A simple proof %J The Teaching of Mathematics %D 2023 %P 14 %V XXVI %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.57016/TM-DVLA5418/ %R 10.57016/TM-DVLA5418 %G en %F 10_57016_TM_DVLA5418