Assume
where is given by (20.2.5) and the minimum is for
, except . Then
20.6.2 |
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20.6.3 |
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20.6.4 |
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20.6.5 |
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Here the coefficients are given by
20.6.6 |
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20.6.7 |
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20.6.8 |
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20.6.9 |
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and satisfy
20.6.10 |
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In the double series the order of summation is
important only when . For further information on see
§23.9: since the double sums in (20.6.6) and (23.9.1)
are the same, we have when .