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Published online by Cambridge University Press: 01 October 2007
We prove that if is a finitely generated abelian group of orientation preserving C1 diffeomorphisms of
which leaves invariant a compact set then there is a common fixed point for all elements of
. We also show that if
is any abelian subgroup of orientation preserving C1 diffeomorphisms of S2 then there is a common fixed point for all elements of a subgroup of
with index at most two.