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Proceedings of the American Mathematical Society
ISSN 1088-6826(e) ISSN 0002-9939(p)

     

When is a $p$-adic power series an endomorphism of a formal group?

Author(s): Hua-Chieh Li
Journal: Proc. Amer. Math. Soc. 124 (1996), 2325-2329.
MSC (1991): Primary 11S99; Secondary 11S31, 14L05
MathSciNet review: 1322933
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Abstract | References | Similar articles | Additional information

Abstract: If $f(x)$ is a noninvertible endomorphism of a formal group, then we have that $f(x)$ commutes with an invertible series and $\overline {\mathcal {O}}[[x]]$ is Galois over $\overline {\mathcal {O}}[[f^n(x)]]$ for all $n\in \mathbf {N}$. We shall prove that the converse of this statement is also true.

References:

1.
N. Koblitz, $p$-adic numbers, $p$-adic analysis, and zeta-functions, Springer-Verlag, New York, 1977. MR 57:5964

2.
J. Lubin, Nonarchimedean dynamical systems, Compositio Math. 94 (1994), 321--346. CMP 95:06

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Additional Information:

Hua-Chieh Li
Affiliation: Department of Mathematics, Brown University, Providence, Rhode Island 02912
Address at time of publication: Department of Mathematics, National Tsin Hua University, Hsin Chu, Taiwan, R.O.C.
Email: li@math.nthu.edu.tw

DOI: 10.1090/S0002-9939-96-03308-4
PII: S 0002-9939(96)03308-4
Received by editor(s): June 25, 1994
Received by editor(s) in revised form: February 9, 1995
Communicated by: William W. Adams
Copyright of article: Copyright 1996, American Mathematical Society




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