Index bounds for homeomorphisms of collapsed surfaces
Let be a collapse of a finite number of surfaces in one of the ways described above. Let be a homeomorphism such that for every map homotopic to , and let be a fixed point of .
Index-bound conjecture. One has
and the fixed-point index of each isolated fixed point is also bounded below by a bound depending on the Euler characteristic of .
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).
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