An algebraic structure of groups of solutions of the third Aczel-Jabotinsky formal differential equation

Wojciech Jablonski, Ludwig Reich

We study the algebraic structure of the groups of solutions of the third Acz{é}l-Jabotinsky differential equation $(H\circ \Phi )(x)=\frac{d\Phi }{dx}\cdot H(x)$ in the rings of formal po…