👉 Hedgeborn is a mathematical concept in the field of topology and geometry that refers to a closed, bounded subset of Euclidean space. It was introduced by mathematician Henri Poincaré in his 1904 paper "Sur la théorie des surfaces" (On the theory of surfaces), where he defined it as an open, dense subset of the three-dimensional Euclidean space R^3 without boundary. The term "hedgeborn" is often used to describe a closed set
