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 . For more complete
details see , . 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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