set of eigenvalues, taking multiplicities into account
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11: 28.29 Definitions and Basic Properties
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►iff is an eigenvalue of the matrix
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►The -periodic or -antiperiodic solutions are multiples of , respectively.
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§28.29(iii) Discriminant and Eigenvalues in the Real Case
… ►To every equation (28.29.1), there belong two increasing infinite sequences of real eigenvalues: … ►
28.29.17
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12: 18.28 Askey–Wilson Class
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►The Askey–Wilson polynomials form a system of OP’s , , that are orthogonal with respect to a weight function on a bounded interval, possibly supplemented with discrete weights on a finite set.
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►Leonard (1982) classified all (finite or infinite) discrete systems of OP’s on a set
for which there is a system of discrete OP’s on a set
such that .
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18.28.26
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18.28.27
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18.28.28
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13: 1.2 Elementary Algebra
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Eigenvectors and Eigenvalues of Square Matrices
… ►Eigenvalues are the roots of the polynomial equation … ►The diagonal elements are not necessarily distinct, and the number of identical (degenerate) diagonal elements is the multiplicity of that specific eigenvalue. … ►Thus is the product of the (counted according to their multiplicities) eigenvalues of . …Thus is the sum of the (counted according to their multiplicities) eigenvalues of . …14: 28.6 Expansions for Small
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§28.6(i) Eigenvalues
►Leading terms of the power series for and for are: … ►The coefficients of the power series of , and also , are the same until the terms in and , respectively. … ►Higher coefficients in the foregoing series can be found by equating coefficients in the following continued-fraction equations: … ►Here for , for , and for and . …15: 29.3 Definitions and Basic Properties
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§29.3(i) Eigenvalues
►For each pair of values of and there are four infinite unbounded sets of real eigenvalues for which equation (29.2.1) has even or odd solutions with periods or . … ►§29.3(ii) Distribution
►The eigenvalues interlace according to …The eigenvalues coalesce according to …16: 3.11 Approximation Techniques
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►It is denoted by .
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►We take
complex exponentials , , and approximate by the linear combination (3.11.31).
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►requires approximately
multiplications.
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►The set of all the polynomials defines a function, the spline, on .
By taking more derivatives into account, the smoothness of the spline will increase.
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17: 31.11 Expansions in Series of Hypergeometric Functions
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►Taking
or the coefficients satisfy the equations
…where we take
and where
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►The expansion (31.11.1) for a Heun function that is associated with any branch of (31.11.2)—other than a multiple of the right-hand side of (31.11.12)—is convergent inside the ellipse .
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§31.11(v) Doubly-Infinite Series
►Schmidt (1979) gives expansions of path-multiplicative solutions (§31.6) in terms of doubly-infinite series of hypergeometric functions. …18: 18.39 Applications in the Physical Sciences
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►The properties of determine whether the spectrum, this being the set of eigenvalues of , is discrete, continuous, or mixed, see §1.18.
Below we consider two potentials with analytically known eigenfunctions and eigenvalues where the spectrum is entirely point, or discrete, with all eigenfunctions being and forming a complete set.
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►and the corresponding eigenvalues are
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►The eigenvalues and radial wave functions are independent of and they both do depend on due to the presence of the ‘fictitious’ centrifugal potential , which is a result of the choice of co-ordinate system, and not the physical potential energy of interaction .
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►with eigenvalues
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19: 28.12 Definitions and Basic Properties
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