More generally any hedgehog space is an example of a real tree.

Hedgehog spaces are examples of real trees.

A -hedgehog space is sometimes called a hedgehog space of spininess .

In mathematics, a hedgehog space is a topological space, consisting of a set of spines joined at a point.

The Paris metric, restricted to the unit disk, is a hedgehog space where K is the cardinality of the continuum.

With the pion isospin vector field oriented in the shape of a hedgehog space, the model is readily solvable, and is thus sometimes called the hedgehog model.

The hedgehog space is a metric space, when endowed with the hedgehog metric if and lie in the same spine, and by if and lie in different spines.