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Re: Negative zeros?
From: |
Stefan van der Walt |
Subject: |
Re: Negative zeros? |
Date: |
Wed, 14 Sep 2005 12:08:12 +0200 |
User-agent: |
Mutt/1.5.9i |
On Tue, Sep 13, 2005 at 08:17:07PM -0400, Vic Norton wrote:
> >"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. Iserles and Powell), Clarendon Press,
> >Oxford, 1987.
> >
> >However, he has many other interesting writings pertaining to
> >Floating-Point on his webpage at
> >
> >http://www.cs.berkeley.edu/~wkahan/
> >
> >(like "Matlab's Loss is Nobody's Gain" and "How Java's Floating-Point
> >hurts Everyone Everywhere").
>
> I am sorry, John, David, and Stephan. I am a mathematician. I don't
> choose to read nonsense. Zero is zero is zero.
Kahan's work is simply an analysis of a (very useful) model.
Thought you'd enjoy this one:
(-a) = (-a) + 0
(-a) = (-a) + 0a
(-a) = (-a) + (1 + (-1))a
(-a) = (-a) + (1a + (-1)a)
(-a) = (-a) + (a + (-1)a)
(-a) = ((-a) + a) + (-1)a
(-a) = 0 + (-1)a
(-a) = (-1)a
Regards
Stéfan
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