Subspace may refer to:

Mathematics

  • A space inheriting all characteristics of a parent space
  • A subset of a topological space endowed with the subspace topology
  • Linear subspace, in linear algebra, a subset of a vector space that is closed under addition and scalar multiplication
  • Flat (geometry), a Euclidean subspace
  • Affine subspace, a geometric structure that generalizes the affine properties of a flat
  • Projective subspace, a geometric structure that generalizes a linear subspace of a vector space
  • Multilinear subspace in multilinear algebra, a subset of a tensor space that is closed under addition and scalar multiplication

Science fiction

  • a concept similar to that of hyperspace
  • Subspace (Star Trek), a fictional feature of space-time that facilitates faster-than-light communication and transit
  • In GODZILLA: Planet of the Monsters, subspace is utilized similarly as in Star Trek as a travel space.

Games

Other uses

  • "Subspace" (song), a 2001 single by Funker Vogt
  • Subspace, in BDSM, a psychological state that can be entered by the submissive participant
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