%0 Journal Article %A Carrillo, Sergio A. %A Hurtado, Miguel %T Appell and Sheffer sequences: on their characterizations through functionals and examples %J Comptes Rendus. Mathématique %D 2021 %P 205-217 %V 359 %N 2 %I Académie des sciences, Paris %U http://www.numdam.org/articles/10.5802/crmath.172/ %R 10.5802/crmath.172 %G en %F CRMATH_2021__359_2_205_0