Recursive bi-orthogonalisation approach and orthogonal projectors

Details Recursive bi-orthogonalisation approach and orthogonal projectors Recursive bi-orthogonalisation approach and orthogonal projectors

2002-09-13

arxiv.org/abs/math-ph/0209026v1

Physics

Mathematical Physics

Scientific paper

An approach is proposed which, given a family of linearly independent functions, constructs the appropriate biorthogonal set so as to represent the orthogonal projector operator onto the corresponding subspace. The procedure evolves iteratively and it is endowed with the following properties: i) it yields the desired biorthogonal functions avoiding the need of inverse operations ii) it allows to quickly update a whole family of biorthogonal functions each time that a new member is introduced in the given set. The approach is of particular relevance to the approximation problem arising when a function is to be represented as a finite linear superposition of non orthogonal waveforms.

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