In the previous section we showed how to construct a quadratic iteration from the case p=2. In this section we show how the cases p=2 and p=4 relate to the Borwein's quadratic and quartic iterations. For an overview of the method see [8]. For more complete details see [4], [6]. In this and the next section we summarise the results needed and omit the proofs. Before stating these results, we first give a brief overview.
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