Index bounds for homeomorphisms of collapsed surfaces

Let XX be a collapse of a finite number of surfaces in one of the ways described above. Let f:XXf:X\rightarrow X be a homeomorphism such that #Fix(f)#Fix(g)\#\mathrm{Fix}(f)\leq\#\mathrm{Fix}(g) for every map gg homotopic to ff, and let xXx\in X be a fixed point of ff.

Index-bound conjecture. One has

ind(x)1,\mathrm{ind}(x)\leq 1,

and the fixed-point index of each isolated fixed point is also bounded below by a bound depending on the Euler characteristic of XX.

The conjecture concerns fixed-point indices for homeomorphisms on spaces obtained by collapsing finitely many compact connected surfaces of non-positive Euler characteristic, with local surface or wedge-of-surfaces structure away from finitely many points. The proposed bounds would extend known index estimates for related wedge spaces, but the source gives no proof or resolution.

Sources & referencesView supporting material

Primary source

Jesús A. Álvarez López and Alejandro O. Majadas-Moure, “New Applications and Computations of the Lefschetz Number of Homeomorphisms and Open Maps”, arXiv:2601.11370 (2026).

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