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template <class ForwardIterator>
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Point_d<R>
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center_of_sphere ( ForwardIterator first, ForwardIterator last)
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returns the center of the sphere spanned by the points in A = tuple[first,last). | Precondition: | A contains d+1 affinely
independent points of dimension d. |
| Requirement: | The value type of
ForwardIterator is Point_d<R>. |
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