Path Triangulation, Cycles and Good Covers on Planar Cell Complexes. Extension of J.H.C. Whitehead's Homotopy System Geometric Realization and E.C. Zeeman's Collapsible Cone Theorems

TL;DR

This paper extends classical homotopy and geometric realization theorems to path triangulations on planar cell complexes, demonstrating collapsibility, generalizations of billiard triangles, and good cover properties.

Contribution

It introduces path triangulation in homotopy theory, extending Whitehead's and Zeeman's theorems, and shows these triangulations form good covers with collapsible properties.

Findings

A cone collapses to a path triangle, extending Zeeman's theorem.

Path triangles generalize billiard triangles with curved edges.

Every path triangulation forms a good cover.

Abstract

This paper introduces path triangulation of points in a bounded, simply connected surface region, replacing ordinary triangles in a Delaunay triangulation with path triangles from homotopy theory. A {\bf path triangle} has a border that is a sequence of paths $h:I\to X, I=[0,1]$. The main results in this paper are that (1) a cone $D\times I$ collapses to a path triangle $h\bigtriangleup K$, extending E.C. Zeeman's collapsible dunce hat cone theorem, (2) an ordinary path triangle with geometrically realized straight edges generalizes Veech's billiard triangle, (3) a billiard ball $K\times I$ collapses to a round path triangle geometrically realized as a triangle with curviliear edges, (4) a geometrically realized homotopy system defined in terms of free group presentations of path triangulations of finite cell complexes extends J.H.C. Whitehead's homotopy system geometric realization theorem and (5) every path triangulation of a cell complex is a good cover.