Orthonormal function system

An orthonormal function system (ONS) is an orthonormal basis in a vector space of functions.[1]

Further information: basis (linear algebra), Fourier analysis, square-integrable, and Hilbert space

References
  1. Melzak, Z. A. (2012), Companion to Concrete Mathematics, Dover Books on Mathematics, Courier Dover Corporation, p. 138, ISBN 9780486135816.


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