An open-air area, such as a park or public garden with no (or very few) buildings, often in an urban area and designated by a local authority or government as such.

(topology) A topological space X (generally assumed to be connected) together with a continuous map μ : X × X → X with an identity element e such that μ(e, x) = μ(x, e) = x for all x in X.

plural of H-space

The air space used by unmanned aerial vehicles

(geometry) That fills a closed (typically 2-dimensional or 3-dimensional) space

(acting) The skill of handling imaginary objects and locations as part of a performance, especially in improv acting.

plural of space tourist

plural of Chebyshev space

plural of Haar space

(approximation theory) A finite-dimensional subspace V of 𝒞(X, 𝕂), where X is a compact space and 𝕂 either the real numbers or the complex numbers, such that for any given f∈𝒞(X, 𝕂) there is exactly one element of V that approximates f "best", i.e. with minimum distance to f in supremum norm.