An orthonormal function system (ONS) is an orthonormal basis in a vector space of functions.[1]
See basis (linear algebra), Fourier analysis, square-integrable, Hilbert space for more.
References
Melzak, Z. A. (2012), Companion to Concrete Mathematics, Dover Books on Mathematics, Courier Dover Corporation, p. 138, ISBN 9780486135816.
Undergraduate Texts in Mathematics
Graduate Studies in Mathematics
Hellenica World - Scientific Library
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