Subspace

Subspace may refer to:

In 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

In science fiction

• Subspace (fictional) or hyperspace, a fictional parallel universe
• Subspace (Star Trek), a fictional feature of space-time that facilitates faster-than-light communication and transit

In games

• SubSpace (video game), a two-dimensional space shooter computer game
• The Subspace Emissary, the two player Adventure mode in the video game Super Smash Bros. Brawl
• Yume Kōjō: Doki Doki Panic and its derivative, Super Mario Bros. 2, both feature a realm called "Subspace" whose primary features include power-up items, health restoration bonuses, and coins used to purchase extra lives
• SubSpace, is the name of a level in the PlayStation version of Final Doom

Other uses

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