quintuple product identity
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11: 27.5 Inversion Formulas
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►If a Dirichlet series generates , and generates , then the product
generates
…called the Dirichlet product (or convolution) of and .
The set of all number-theoretic functions with forms an abelian group under Dirichlet multiplication, with the function in (27.2.5) as identity element; see Apostol (1976, p. 129).
…For example, the equation is equivalent to the identity
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27.5.8
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12: 1.18 Linear Second Order Differential Operators and Eigenfunction Expansions
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►A complex linear vector space is called an inner product space if an inner product
is defined for all with the properties: (i) is complex linear in ; (ii) ; (iii) ; (iv) if then .
With norm defined by
…Two elements and in are orthogonal if .
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►thus generalizing the inner product of (1.18.9).
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►The adjoint of does satisfy where .
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13: 20.4 Values at = 0
14: 22.9 Cyclic Identities
§22.9 Cyclic Identities
… ►§22.9(ii) Typical Identities of Rank 2
… ► ►§22.9(iii) Typical Identities of Rank 3
… ►15: 25.15 Dirichlet -functions
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25.15.2
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►with the product taken over all primes , beginning with .
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25.15.4
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25.15.6
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16: 27.14 Unrestricted Partitions
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►Euler introduced the reciprocal of the infinite product
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§27.14(v) Divisibility Properties
►Ramanujan (1921) gives identities that imply divisibility properties of the partition function. For example, the Ramanujan identity …implies . …17: 25.10 Zeros
18: 27.8 Dirichlet Characters
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27.8.6
►A Dirichlet character is called primitive (mod ) if for every proper divisor of (that is, a divisor ), there exists an integer , with and .
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27.8.7
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►Every Dirichlet character (mod ) is a product
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19: Bibliography R
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A non-negative representation of the linearization coefficients of the product of Jacobi polynomials.
Canad. J. Math. 33 (4), pp. 915–928.
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Integral representations for products of Airy functions. II. Cubic products.
Z. Angew. Math. Phys. 48 (4), pp. 646–655.
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Integral representations for products of Airy functions. III. Quartic products.
Z. Angew. Math. Phys. 48 (4), pp. 656–664.
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Combinatorial Identities.
Robert E. Krieger Publishing Co., Huntington, NY.
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Partial fractions expansions and identities for products of Bessel functions.
J. Math. Phys. 46 (4), pp. 043509–1–043509–18.
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