Let be an abelian group consisting of the direct product of -times for . Let . My question is this: if is an automorphism of then does extend to an automorphism of ? If not in general, what if is prime?
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About LinkBacksbe an abelian group consisting of the direct product of
-times for
. Let
.
is an automorphism of
then does
? If not in general, what if
is prime?
