Index bounds for homeomorphisms of collapsed surfaces
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.
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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