Stable Numerics Subroutine Library
Programming Reference Manual
Version 1.0 DD-00006-010
3.3.3 Whole Interval

In RC  arithmetic a whole interval has both the real and imaginary sub-intervals as whole intervals, that is:

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ℜi(k)=ℑi(k)=-∞  ∧ℜi(k)=ℑi(k)=∞