Extended interval arithmetic may be used to render graphs. Extended interval arithmetic is similar to , with the restriction that each interval set contain either one or two intervals. If the set contains two intervals, one interval must contain ; the other interval must contain .
An algorithm employing extended interval arithmetic may readily graph specifications given using +, -, , and ; the more general interval sets are needed if operations such as or may occur in a specification.
Jeff Tupper | March 1996 |