 Eigenplane

In mathematics, an eigenplane is a two-dimensional invariant subspace in a given vector space.By analogy with the term "eigenvector" for a vector which, when operated on by a linear operator is another vector which is a scalar multiple of itself, the term eigenplane can be used to describe a two-dimensional plane (a "2-plane"), such that the operation of a linear operator on a vector in the 2-plane always yields another vector in the same 2-plane.