Numeric comparison anomaly

[Paul Rubin]

Erik Max Francis <max at alcyone.com> writes:
> Infinity as a limit needs either to be positive infinity or negative
> infinity; if unstated, it's positive infinity.  There's no "unsigned
> infinity."

IEEE 754 supports unsigned (projective) infinity.  This is useful for
complex arithmetic, among other things.  The extended complex numbers
include projective infinity.  There's no positive or negative
infinity.