symmetric%20elliptic%0Aintegrals
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11: 19.38 Approximations
§19.38 Approximations
►Minimax polynomial approximations (§3.11(i)) for and in terms of with can be found in Abramowitz and Stegun (1964, §17.3) with maximum absolute errors ranging from 4×10⁻⁵ to 2×10⁻⁸. Approximations of the same type for and for are given in Cody (1965a) with maximum absolute errors ranging from 4×10⁻⁵ to 4×10⁻¹⁸. … ►12: 19.1 Special Notation
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►All derivatives are denoted by differentials, not by primes.
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►We use also the function , introduced by Jahnke et al. (1966, p. 43).
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►However, it should be noted that in Chapter 8 of Abramowitz and Stegun (1964) the notation used for elliptic integrals differs from Chapter 17 and is consistent with that used in the present chapter and the rest of the NIST Handbook and DLMF.
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, , and are the symmetric (in , , and ) integrals of the first, second, and third kinds; they are complete if exactly one of , , and is identically 0.
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is a multivariate hypergeometric function that includes all the functions in (19.1.3).
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13: 19.21 Connection Formulas
§19.21 Connection Formulas
… ►If and , then as (19.21.6) reduces to Legendre’s relation (19.21.1). … ► is symmetric only in and , but either (nonzero) or (nonzero) can be moved to the third position by using …Because is completely symmetric, can be permuted on the right-hand side of (19.21.10) so that if the variables are real, thereby avoiding cancellations when is calculated from and (see §19.36(i)). … ►§19.21(iii) Change of Parameter of
…14: 19.25 Relations to Other Functions
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§19.25(ii) Bulirsch’s Integrals as Symmetric Integrals
… ►§19.25(v) Jacobian Elliptic Functions
… ► ►§19.25(vi) Weierstrass Elliptic Functions
… ►15: 19.18 Derivatives and Differential Equations
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§19.18(i) Derivatives
… ►§19.18(ii) Differential Equations
… ►and two similar equations obtained by permuting in (19.18.10). … ►The next four differential equations apply to the complete case of and in the form (see (19.16.20) and (19.16.23)). … ►Similarly, the function satisfies an equation of axially symmetric potential theory: …16: 19.19 Taylor and Related Series
§19.19 Taylor and Related Series
►For define the homogeneous hypergeometric polynomial … ►Define the elementary symmetric function by … ►The number of terms in can be greatly reduced by using variables with chosen to make . … ►17: 19.24 Inequalities
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§19.24(i) Complete Integrals
►The condition for (19.24.1) and (19.24.2) serves only to identify as the smaller of the two nonzero variables of a symmetric function; it does not restrict validity. … ► ►§19.24(ii) Incomplete Integrals
… ►The same reference also gives upper and lower bounds for symmetric integrals in terms of their elementary degenerate cases. …18: 19.22 Quadratic Transformations
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