Hilbert Space

Named for its putative inventor, mathematician David Hilbert (who some claim found the solutions for Einstein's equations before "L'il Albie" did himself), Hilbert Space is a concept which has been often applied in mathematics, quantum mechanics, and in general metaphysics (for instance, concepts like "parallel universes"). In short, a Hilbert Space is a mathematical construct such that within any plenum of n-dimensional spaces there exists an infinite number of said Hilbert Spaces (subsumed within an n+1 dimensional superset). Fancifully, science fiction writers point to the infinite plurality of 4D Hilbert Spaces that could exist within our "normal" 5D continuum, and suggest that each such Hilbert Space may really exist and that these Hilbert Spaces could be engendered by time-travel to the past. Thus, each 4D Hilbert Space in a 5D superset of "Universes" could possess a unique history, entirely different from all other universes contained within the 5D "Universe".