Index bounds for homeomorphisms of collapsed surfaces

Less than 1 year old · traced to

Let XX be a collapse of a finite number of surfaces in one of the ways described above. Let f:X→Xf: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 x∈Xx\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.

References

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).

Progress summary

Never refreshed

Nothing recorded yet. Refresh searches the literature and the public web for attempts on this problem, and writes the first summary here.

Solutions 0

No solutions have been posted yet.