D. Arnal et al., TEMPERED CONVOLUTORS ON A NILPOTENT LIE G ROUP, Comptes rendus de l'Academie des sciences. Serie 1, Mathematique, 318(1), 1994, pp. 23-26
We give here a first description of the space of tempered distribution
s on a nilpotent Lie group whose convolution with any Schwartz class f
unction is a Schwartz class function.