Homotopy CW-complex conjecture for ascending and descending links

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In the situation of Theorem

, let $L^-_V(p)$ and $L^+_V(p)$ be the descending and ascending links, let ${\cal I}$ be the poset of closed unions of strata of ${\cal S}$, and let ${\cal L}^{\pm}_V(p)$ denote the corresponding sets of cells. **Homotopy CW-complex conjecture.** There exist CW-complexes $K^-_V(p)$ and $K^+_V(p)$, with cell sets ${\cal K}^-_V(p)$ and ${\cal K}^+_V(p)$, together with dimension-preserving bijections

k^-:{\cal K}^-_V(p)\to{\cal L}^-_V(p),\qquad k^+:{\cal K}^+_V(p)\to{\cal L}^+_V(p),

such that these bijections make the CW-complexes ${\cal I}$-filtered spaces and there are homotopy equivalences of ${\cal I}$-filtered spaces

h^-_V(p):K^-_V(p)\to L^-_V(p),\qquad h^+_V(p):K^+_V(p)\to L^+_V(p).

Thisisahomotopy−levelrefinementofthecellulardescriptionofthelinksinTheoremThis is a homotopy-level refinement of the cellular description of the links in Theorem

, analogous to the classical Morse-theoretic result that a manifold is homotopy equivalent to a CW-complex whose cells correspond to critical points. The conjecture is presented as a strengthening of the earlier informal claim and is intended to provide filtered homotopy models for both links.

References

Primary source

Mikhail Grinberg, “Dimensions of the Ascending and Descending Sets in Complex Stratified Morse Theory”, arXiv:1005.4488 (2010).

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