For a finite group
G and a
G-map
f :
X →
Y of degree one, where
X and
Y are compact, connected, oriented, 3-dimensional, smooth
G-manifolds, we give an obstruction element σ(
f) in a
K-theoretic group called the Bak group, with the property: σ(
f)=0 guarantees that one can perform
G-surgery on
X so as to convert
f to a homology equivalence
f' :
X' →
Y. Using this obstruction theory, we determine the
G-homeomorphism type of the singular set of a smooth action of
A5 on a 3-dimensional homology sphere having exactly one fixed point, where
A5 is the alternating group on five letters.
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