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The smooth structure set of $S^p \times S^q$

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abstract

We calculate the smooth structure set of $S^p \times S^q$, $S(p, q)$, for $p, q \geq 2$ and $p+q \geq 5$. As a consequence we show that in general $S(4j-1, 4k)$ cannot admit a group structure such that the smooth surgery exact sequence is a long exact sequence of groups. We also show that the image of forgetful map $F: S(4j, 4k) --> S^{Top}(4j, 4k)$ is not in general a subgroup of the topological structure set.

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math.AT 1

years

2026 1

verdicts

UNVERDICTED 1

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Smooth manifolds homotopy equivalent to products of spheres

math.AT · 2026-06-08 · unverdicted · novelty 7.0

Classifies smooth closed oriented manifolds homotopy equivalent to three families of sphere products up to almost diffeomorphism by realizing the image of the normal-invariant map with explicit constructions from bundles and plumbings.

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  • Smooth manifolds homotopy equivalent to products of spheres math.AT · 2026-06-08 · unverdicted · none · ref 4 · internal anchor

    Classifies smooth closed oriented manifolds homotopy equivalent to three families of sphere products up to almost diffeomorphism by realizing the image of the normal-invariant map with explicit constructions from bundles and plumbings.