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Hilbert spaces provide the mathematical foundation for signal processing theory. In this section we attempt to clearlydefine some key Hilbert space concepts like vectors , norms , inner products , subspaces , orthogonality , orthonormal bases , and projections . The intent is not to bury you in mathematics, but to familiarize you with the terminology,provide intuition, and leave you with a "lookup table" for future reference.

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Source:  OpenStax, Digital signal processing (ohio state ee700). OpenStax CNX. Jan 22, 2004 Download for free at http://cnx.org/content/col10144/1.8
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