Signed infinity and signed zero Re: [Maxima] proposal to change acos
Subject: Signed infinity and signed zero Re: [Maxima] proposal to change acos
From: Barton Willis
Date: Mon, 28 Nov 2005 10:39:35 -0600
-----Richard Fateman wrote: -----
>If you have +inf and -inf you should also have +0
>and -0, and 0/0= undef. (projective mode)
Maxima does have 'zerob' (zero below, I believe) and
'zeroa' (zero above). Limit knows something about
zeroa and zerob:
(%i96) limit(zeroa);
(%o96) 0
(%i97) limit(1/x,x,zeroa);
(%o97) inf
(%i98) limit(1/x,x,zerob);
(%o98) minf
But most of Maxima doesn't know anything about 'zeroa'
or 'zerob.' Maybe we could make the IEEE 0.0+ --> zeroa
and 0.0- --> zerob?
Barton