Abstract: | In this article, we characterize the space of Fourier transforms of the smooth compactly supported functions on a semisimple Lie group with one conjugacy class of Cartan subgroups (cf. th. 6). We get also results on the space of Fourier transforms of the elements of the enveloping algebra of the Lie algebra of such a group (cf. th. 1, 2, and 3). |