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Reference.org
Orthonormal function system
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<p>An orthonormal function system (ONS) is an <a href="/facts/Orthonormal/JfgL1nAh">orthonormal</a> <a href="/facts/Basis_(linear_algebra)/89IPoN6c">basis</a> in a <a href="/facts/Vector_space/M1pxMLx2">vector space</a> of <a href="/facts/Function_(mathematics)/CdReEKCh">functions</a>. </p>