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21: 24.5 Recurrence Relations
§24.5 Recurrence Relations
… ►
24.5.3
,
…
►
24.5.5
►
§24.5(ii) Other Identities
… ►§24.5(iii) Inversion Formulas
…22: Preface
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►The new DLMF (Digital Library of Mathematical Functions) will appear in a hardcover edition and as a free electronic publication on the World Wide Web.
The authors will review the relevant published literature and produce approximately twice the number of formulas that were contained in the original Handbook.
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23: 24.6 Explicit Formulas
24: 27.13 Functions
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►
§27.13(i) Introduction
►Whereas multiplicative number theory is concerned with functions arising from prime factorization, additive number theory treats functions related to addition of integers. …The subsections that follow describe problems from additive number theory. … ►§27.13(ii) Goldbach Conjecture
… ►§27.13(iii) Waring’s Problem
…25: 26.13 Permutations: Cycle Notation
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►The Stirling cycle numbers of the first kind, denoted by , count the number of permutations of with exactly cycles.
They are related to Stirling numbers of the first kind by
…See §26.8 for generating functions, recurrence relations, identities, and asymptotic approximations.
…
►The derangement number, , is the number of elements of with no fixed points:
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►A permutation is even or odd according to the parity of the number of transpositions.
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26: 27.9 Quadratic Characters
§27.9 Quadratic Characters
►For an odd prime , the Legendre symbol is defined as follows. … ►
27.9.2
►If are distinct odd primes, then the quadratic reciprocity law states that
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►If an odd integer has prime factorization , then the Jacobi symbol
is defined by , with .
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27: 31.14 General Fuchsian Equation
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►The general second-order Fuchsian equation with regular singularities at , , and at , is given by
►
31.14.1
.
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►The three sets of parameters comprise the singularity parameters
, the exponent parameters
, and the
free accessory parameters
.
With and the total number of free parameters is .
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►
31.14.3
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28: 24.21 Software
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►
§24.21(ii) , , , and
…29: 27.19 Methods of Computation: Factorization
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►Techniques for factorization of integers fall into three general classes: Deterministic algorithms, Type I probabilistic algorithms whose expected running time depends on the size of the smallest prime factor, and Type II probabilistic algorithms whose expected running time depends on the size of the number to be factored.
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►As of January 2009 the largest prime factors found by these methods are a 19-digit prime for Brent–Pollard rho, a 58-digit prime for Pollard , and a 67-digit prime for ecm.
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►These algorithms include the Continued Fraction Algorithm (cfrac), the Multiple Polynomial Quadratic Sieve (mpqs), the General
Number Field Sieve (gnfs), and the Special Number Field Sieve (snfs).
…The snfs can be applied only to numbers that are very close to a power of a very small base.
The largest composite numbers that have been factored by other Type II probabilistic algorithms are a 63-digit integer by cfrac, a 135-digit integer by mpqs, and a 182-digit integer by gnfs.
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