Biorthogonal system
In mathematics, a biorthogonal system is a pair of indexed families of vectors
- in E and in F
such that
where E and F form a pair of topological vector spaces that are in duality, ⟨·,·⟩ is a bilinear mapping and is the Kronecker delta.
An example is the pair of sets of respectively left and right eigenvectors of a matrix, indexed by eigenvalue, if the eigenvalues are distinct.[1]
A biorthogonal system in which E = F and is an orthonormal system.
Projection
Related to a biorthogonal system is the projection
- ,
where ; its image is the linear span of , and the kernel is .
Construction
Given a possibly non-orthogonal set of vectors and the projection related is
- ,
where is the matrix with entries .
- , and then is a biorthogonal system.
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See also
- Dual basis
- Dual space
- Dual pair
- Orthogonality
- Orthogonalization
References
- Bhushan, Datta, Kanti (2008). Matrix And Linear Algebra, Edition 2: AIDED WITH MATLAB. PHI Learning Pvt. Ltd. p. 239. ISBN 9788120336186.
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