Lifting endomorphisms of formal A-modules over finite fields |
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Authors: | Hua-Chieh Li |
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Institution: | Department of Mathematics, National Taiwan Normal University, Taipei, Taiwan, ROC |
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Abstract: | 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. |
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Keywords: | 11S31 14L05 16W60 |
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