orthonormal
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1: 28.30 Expansions in Series of Eigenfunctions
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►Let , , be the set of characteristic values (28.29.16) and (28.29.17), arranged in their natural order (see (28.29.18)), and let , , be the eigenfunctions, that is, an orthonormal set of -periodic solutions; thus
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2: 32.15 Orthogonal Polynomials
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►Let , , be the orthonormal set of polynomials defined by
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3: 1.3 Determinants, Linear Operators, and Spectral Expansions
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►The corresponding eigenvectors can be chosen such that they form a complete orthonormal basis in .
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Orthonormal Expansions
►Assuming is an orthonormal basis in , any vector may be expanded as …4: 33.14 Definitions and Basic Properties
5: 31.15 Stieltjes Polynomials
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31.15.12
►The normalized system of products (31.15.8) forms an orthonormal basis in the Hilbert space .
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6: 18.2 General Orthogonal Polynomials
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►(iii) orthonormal OP’s: (and usually, but not always, );
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Monic and Orthonormal Forms
… ►In terms of the monic OP’s define the orthonormal OP’s by …Then, with the coefficients (18.2.11_4) associated with the monic OP’s , the orthonormal recurrence relation for takes the form … ►The monic and orthonormal OP’s, and their determination via recursion, are more fully discussed in §§3.5(v) and 3.5(vi), where modified recursion coefficients are listed for the classical OP’s in their monic and orthonormal forms. …7: 18.36 Miscellaneous Polynomials
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►Exceptional type I -EOP’s, form a complete orthonormal set with respect to a positive measure, but the lowest order polynomial in the set is of order , or, said another way, the first polynomial orders, are missing.
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►and orthonormal with respect to the weight function
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8: 30.15 Signal Analysis
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►The sequence , forms an orthonormal basis in the space of -bandlimited functions, and, after normalization, an orthonormal basis in .
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9: 1.18 Linear Second Order Differential Operators and Eigenfunction Expansions
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►A (finite or countably infinite, generalizing the definition of (1.2.40)) set is an orthonormal set if the are normalized and pairwise orthogonal.
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►For an orthonormal set in a Hilbert space
Bessel’s inequality holds:
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►Such orthonormal sets are called complete.
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► The analogous orthonormality is
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►If an eigenvalue is of multiplicity greater than then an orthonormal basis of eigenfunctions can be given for the eigenspace.
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