(rare) A male given name from the Germanic languages. / A surname originating as a patronymic.

(functional analysis) A generalized Euclidean space in which mathematical functions take the place of points; crucial to the understanding of quantum mechanics and other applications.

(topology) A metrizable topological space which is the product of a countably infinite number of closed intervals.

plural of Hilbert curve

(geometry) A continuous fractal space-filling curve.

plural of Hilbert cube

plural of Hilbert space

(mathematics) An incomplete metric space with an inner product.

The quotient of a Hilbert space by an equivalence relation which considers a pair of vectors equivalent iff they differ only by a factor which is a complex number.

plural of pre-Hilbert space