# Negative-dimensional space

In topology, a discipline within mathematics, a negative-dimensional space is an extension of the usual notion of space, allowing for negative dimensions.[1]

## Definition

Suppose that Mt0 is a compact space of Hausdorff dimension t0, which is an element of a scale of compact spaces embedded in each other and parametrized by t (0 < t < ∞). Such scales are considered equivalent with respect to Mt0 if the compact spaces constituting them coincide for tt0. It is said that the compact space Mt0 is the hole in this equivalent set of scales, and t0 is the negative dimension of the corresponding equivalence class.[2]

## History

By the 1940s, the science of topology had developed and studied a thorough basic theory of topological spaces of positive dimension. Motivated by computations, and to some extent aesthetics, topologists searched for mathematical frameworks that extended our notion of space to allow for negative dimensions. Such dimensions, as well as the fourth and higher dimensions, are hard to imagine since we are not able to directly observe them. It wasn’t until the 1960s that a special topological framework was constructed—the category of spectra. A spectrum is a generalization of space that allows for negative dimensions. The concept of negative-dimensional spaces is applied, for example, to analyze linguistic statistics.[3]