Casson invariant is a homotopy invariant
Weiping Li and Hyam Rubinstein
(
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We use Waldhausen's
degree-1 map techniques related to
Heegaard decomposition to show that
the Casson invariant of integral homology 3-spheres invariant under the orientation-preserving homotopy equivalent maps.
The methods used in the proof are
degree-1 map, perturbations, orientation
comparison and normal bundles.
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