Biorthogonal system
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In mathematics, a biorthogonal system is a pair of indexed families of vectors such that where and 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 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.
See also
- Dual basis – Linear algebra concept
- Dual space – In mathematics, vector space of linear forms
- Dual pair
- Orthogonality – Various meanings of the terms
- Orthogonalization
References
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