%0 Journal Article %A Radu Ignat %T A short proof of the $C^{1,1}$ regularity for the eikonal equation %J Comptes Rendus. Mathématique %D 2025 %P 887-891 %V 363 %I Académie des sciences, Paris %R 10.5802/crmath.768 %G en %F CRMATH_2025__363_G9_887_0