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complete: 'no' rigour: proven- rigour details: A fixed-precision value wrapped in an interval field, which records- no error of its own. The working precision was half as many digits again as were- written, and nothing checked that the margin sufficed.+ rigour details: Computed in interval or ball arithmetic throughout, so the digits+ written follow from the width of the result rather than from a guard chosen in+ advance. Display properties: number-header: $\exp(2\pi i k/n)$
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