Abstract:
In this paper an explicit classification of formal $A$-modules over the ring of integer of local field up to the strict isomorphism in the case of small ramification is obtained. The canonic representatives in each class of isomorphic formal $A$-modules are described. This results generalizes the classification of $\mathbb Z_p$-modules in small ramification.
Key words and phrases:formal groups, formal modules, multidimensional formal groups.