HYPERSPACE

'Hyperspace' may refer to:

★ Hyperspace (science fiction), a concept often used in science fiction writing

★ ''Hyperspace'' (book), a book by Dr. Michio Kaku that attempts to explain the possibility of ten-dimensional space using string theory

★ Minkowski spacetime, a concept, often referred to by science fiction writers as "hyperspace", that refers to the four-dimensional space-time of special relativity

★ Hyperspace theory

★ ''Space (documentary)'', a 2001 BBC documentary that was distributed in the U.S. as ''Hyperspace''
'Hyperspace' also sounds similar to several terms used in mathematics, the term ''hyper'' often being used to refer to higher dimensional constructs:

★ 'Hyperspace', a Euclidean space of dimension greater than three. (The term was common in late nineteenth century British books, sometimes in the context of paranormal fantasies, but has become rarer since then.)

★ In topology a hyperspace is a topological space whose elements are subsets of another topological space.

★ Hyperplane, an affine subspace of codimension one in such a space.

★ Hypersphere, a round sphere dimension higher than 3, especially if embedded in such a space.

★ Hypersurface, a submanifold of codimension one, especially if embedded in such a space. This term includes ''hypersphere'' and ''hyperplane'' as special cases.

★ Tesseract, also known as a ''hypercube'', a cube '[0,1]'^d, where 'd' > 3. The word ''tesseract'' was used, especially in nineteenth and early twentieth century British semi-popular books on mathematics, to denote the special case 'd' = 4.