The question reminded me of a passage in Plauger's *The Standard C Library* 

  "The library [math.h] doesn't try to distinguish +0 from -0. IEEE 754 
worries quite
  a bit about this distinction. All the architectures I mentioned above can 
  both flavors of zero. But I have trouble accepting (or even 
understanding) the 
  rationale for this extra complexity. I can sympathize with recent 
critiques of the 
  IEEE 754 Standard that challenge that rationale. Most of all, I found the 
  quite hard enough to write without fretting about the sign of nothing." 


On Monday, February 5, 2018 at 5:42:00 PM UTC-6, David K. Storrs wrote:
> I noticed that (number->string -nan.0) yields "+nan.0" instead of "-nan.0" 
> as I would have expected.  It's not an issue for me, but I was wondering 
> why this is?

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