Peter Scott, in his survey "The Geometries of 3-Manifolds", states that the family of spheres defining the decomposition of a given 3-manifold $M$ into primes is not unique up to isotopy even when $M$ is orientable. Can someone give an example for this?
2026-03-25 22:26:56.1774477616
Non-uniquness of spheres in the prime decomposition up to isotopy
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