The physical space closely surrounding a person, which can lead to discomfort, anger or anxiety if encroached on.

plural of prehilbert space

Alternative form of pre-Hilbert space

plural of Fock space

(mathematics) An algebraic system used in quantum mechanics to describe quantum states with a variable or unknown number of particles.

(topology) A topological space for which any pair of distinct points are also topologically distinct, i.e., there is an open set which contains one of the points but not the other one.

plural of Lindelöf space

(topology) An n-dimensional topological space with a distinguished element µ of its nth homology group such that taking the cap product with an element of the kth cohomology group yields an isomorphism to the (n − k)th cohomology group.

(typography) thin space

(in fonts whose digits are of uniform width) A space of non-variable width: ⊣ ⊢ equal to the width of a digit.