Two subspaces and of are said to be orthogonal if the dot product for all vectors and all .
Orthogonal Subspaces
See also
Dot Product, SubspaceExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Orthogonal Subspaces." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/OrthogonalSubspaces.html