Stable Numerics Subroutine Library
Programming Reference Manual
Version 1.1 DD-00006-011

3.3 Rectangular Complex Interval Arithmetic RC

Rectangular complex arithmetic RC  consists of two intervals IR  representing the real ℜ and imaginary ℑ component of a complex number C  . Geometrically a rectangular complex interval is a box in Cartesian two-dimensional space. Given a rectangular complex interval k ∈RC  where the extraction operators ℜi(k),ℑi(k)∈ IR  are used to extract the real and imaginary components a rectangular complex consists of a set of all complex numbers v∈ C  that uphold:

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RC= {(ℜi(k)≤ℜ(v)≤ ℜi(k)∧ (ℑi(k)≤ℑ(v)≤ ℑi(k)}

3.3.1 Singleton Interval
3.3.2 Empty Interval
3.3.3 Whole Interval