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11—20 of 783 matching pages
11: 21.5 Modular Transformations
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βΊLet , , , and
be
matrices with integer elements such that
…Here is an eighth root of unity, that is, .
For general , it is difficult to decide which root needs to be used.
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βΊ( invertible with integer elements.)
…For a matrix we define , as a column vector with the diagonal entries as elements.
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12: 32.9 Other Elementary Solutions
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βΊwith an arbitrary constant, which is solvable by quadrature.
… with , has the general solution , with and arbitrary constants.
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βΊ
32.9.7
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βΊwith an arbitrary constant, which is solvable by quadrature.
…, with and , has solutions , with an arbitrary constant.
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13: 33.10 Limiting Forms for Large or Large
14: 18.8 Differential Equations
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βΊ
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15: 9.4 Maclaurin Series
16: 28.8 Asymptotic Expansions for Large
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βΊAlso let and (§18.3).
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βΊ
28.8.4
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βΊ
28.8.6
βΊ
28.8.7
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βΊIt is stated that corresponding uniform approximations can be obtained for other solutions, including the eigensolutions, of the differential equations by application of the results, but these approximations are not included.
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17: 19.36 Methods of Computation
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βΊIf (19.36.1) is used instead of its first five terms, then the factor in Carlson (1995, (2.2)) is changed to .
βΊFor both and the factor in Carlson (1995, (2.18)) is changed to when the following polynomial of degree 7 (the same for both) is used instead of its first seven terms:
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βΊAll cases of , , , and are computed by essentially the same procedure (after transforming Cauchy principal values by means of (19.20.14) and (19.2.20)).
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βΊThe step from to is an ascending Landen transformation if (leading ultimately to a hyperbolic case of ) or a descending Gauss transformation if (leading to a circular case of ).
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βΊHere is computed either by the duplication algorithm in Carlson (1995) or via (19.2.19).
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18: 19.17 Graphics
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βΊFor , , and , which are symmetric in , we may further assume that is the largest of if the variables are real, then choose , and consider only and .
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βΊTo view and for complex , put , use (19.25.1), and see Figures 19.3.7–19.3.12.
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βΊTo view and for complex , put , use (19.25.1), and see Figures 19.3.7–19.3.12.
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βΊ
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βΊ
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19: 27.2 Functions
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βΊ( is defined to be 0.)
…It can be expressed as a sum over all primes :
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βΊIt is the special case of the function that counts the number of ways of expressing as the product of factors, with the order of factors taken into account.
…Note that .
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βΊTable 27.2.2 tabulates the Euler totient function , the divisor function (), and the sum of the divisors (), for .
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