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Re: [Chicken-users] From inexact to exact using the "-" procedure?

From: John Cowan
Subject: Re: [Chicken-users] From inexact to exact using the "-" procedure?
Date: Fri, 23 Mar 2012 16:41:07 -0400
User-agent: Mutt/1.5.18 (2008-05-17)

Jeronimo Pellegrini scripsit:

> #;5> (- a b)
> 1.0

The imaginary part vanishes because R5RS treats 1.0+0.0i as a real number.
However, R6RS does not and R7RS currently does not either, though that
may change as a result of a current debate.  The rationale is that you
don't know if the complex number is actually on the real line or just
too close to it to discriminate.

Overhead, without any fuss, the stars were going out.
        --Arthur C. Clarke, "The Nine Billion Names of God"
                John Cowan <address@hidden>

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