2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/152188We introduce the spherical phylon group, a subgroup of the group of all formal diffeomorphisms of $\R^d$ that fix the origin. The invariant theory of the spherical phylon group is used to understand the invariants of the Laplace transform.14 pages, LatexDifferential Geometrytext