%0 Journal Article %A Gutiérrez, Álvaro %A Rosas, Mercedes H. %T Necessary conditions for the positivity of Littlewood–Richardson and plethystic coefficients %J Comptes Rendus. Mathématique %D 2023 %P 1163-1173 %V 361 %N G7 %I Académie des sciences, Paris %U http://geodesic.mathdoc.fr/articles/10.5802/crmath.468/ %R 10.5802/crmath.468 %G en %F CRMATH_2023__361_G7_1163_0