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ANNALES DE L’INSTITUT FOURIER
ELDER GOVE GRIFFITH
Galois module structure of ideals in wildly ramified
cyclic extensions of degree p2
Annales de l’institut Fourier, tome 48, no 2 (1998), p. 609-610
<http://www.numdam.org/item?id=AIF_1998__48_2_609_0>
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Ann. Inst. Fourier, Grenoble
48, 2 (1998), 609-610
CORRIGENDUM
GALOIS MODULE STRUCTURE OF IDEALS IN WILDLY
RAMIFIED CYCLIC EXTENSIONS OF DEGREE p2
by Gove Griffith ELDER
(Article paru dans Ie tome 45 (1995), fascicule 3, pp. 625-647)
The author would like to thank Nigel Byott for pointing out the errors
in Theorem 1. Base upon the following lemmas the exponents dn b and hi
should read:
• Based upon Lemma 8, dr = \(n + (r + l)p&i)/p2'] — max {|'n/p2],
^2,0 - <°o}-
r-l
• Based upon Lemma 7, b = ^ (f(n — (p — j — l)?^)/?2!
j=0,Sj>p-l
- ^(^-h-JW^21)+ E1 (min {\(\^n)-{s,-j)b,)/p\ -
j=0,p-l^Sj>p-2
e^\(n-(p-j-l)pb,)/p^}-^n-(p-j)pb,)/p^)+ E max {0, \^(n)
J=r,Sj>p-l
eo - ^(?7'+rP6l)/P2^}•
r-l
• Based upon Lemma 7, hi = ^ max{0, f(n — (p — j — l)pb^)/
j=O^Sj-l=i
P2] - r(A2,i(n) - (^ - j)b,)/p] + eo} + _El_.(mm {\{\^i{n) - (s, -
M/p-} - eo, \{n - (p - j - l)pb,)/p^} -^{n - (p - j)pb,)/p^) +
T
E max {0,A2,oH - eo - \(n+rpb^)/p2^}.
J=r,Sj=i
A cursory glance at the statement of Theorem 1 might suggest the
appearance of many different types of (R^, R^ X'1) in a given ideal. This is
610 CORRIGENDUM
misleading. Usually only one or two hi is nonzero. In fact, generally the
only nonzero hi are hr and /^r+i-
Finally, we note one may use Nakayama's lemma instead of our
methods, see 640-644, to prove Step 3, for example [G.G. Elder and
M.J. Madan, Galois module structure of integers in wildly ramified Cp x Cp-
extensions, Can. J. Math., 49, n°4 (1997), 722-735].
January 1, 1998.
Gove Griffith ELDER,
University of Nebraska at Omaha
College of Arts and Sciences
Department of Mathematics
Omaha, NE 68182-0243 (USA).
elder@unomaha.edu


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