Lifting endomorphisms of formal A-modules over finite fields

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Lubin conjectures that for an invertible series to commute with a noninvertible series with only simple roots of iterates, two such commuting power series must be endomorphisms of a single formal group. In this paper, we show that if the reduction of these two commuting power series are endomorphisms of a formal group, then themselves are endomorphisms of a formal group.

Original languageEnglish
Pages (from-to)59-70
Number of pages12
JournalJournal of Number Theory
Issue number1
Publication statusPublished - 2007 Mar 1



  • Formal A-module
  • Formal group law
  • p-Adic dynamical systems

ASJC Scopus subject areas

  • Algebra and Number Theory

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