## Abstract

The pentagram map takes a planar polygon P to a polygon P^{′} whose vertices are the intersection points of consecutive shortest diagonals of P. The orbit of a convex polygon under this map is a sequence of polygons which converges exponentially to a point. Furthermore, as recently proved by Glick, coordinates of that limit point can be computed as an eigenvector of a certain operator associated with the polygon. In the present paper we show that Glick’s operator can be interpreted as the infinitesimal monodromy of the polygon. Namely, there exists a certain natural infinitesimal perturbation of a polygon, which is again a polygon but in general not closed; what Glick’s operator measures is the extent to which this perturbed polygon does not close up.

Original language | English (US) |
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Journal | Unknown Journal |

State | Published - Jun 12 2020 |

## ASJC Scopus subject areas

- General