(j3.2006) the IEEE modules and distinguishing zero values

[Van Snyder]

On Wed, 2011-11-16 at 00:53 -0800, Malcolm Cohen wrote:
> There actually good reasons for not distinguishing zeroes in SIGN and
> in formatted output (no-one cares about ATAN2)

except mathematicians who want to be careful.

Read "Branch Cuts for Complex Elementary Functions, or Much Ado About
Nothing's Sign Bit" by William Kahan in "The State of the Art in
Numerical Analysis", Eds. Arieh Iserles and Michael J.D. Powell,
Clarendon Press, Oxford (1987).