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interval arithmetic

From: Geordie McBain
Subject: interval arithmetic
Date: Mon, 4 Aug 2003 11:52:39 +1000

The Emacs program GNU Calc has this capacity.  It allows `interval
forms' and `error forms': e.g.

    sqrt([2 .. 4]) 
    => [1.41421356237 .. 2]

    sqrt(3 +/- 1)
    => 1.73205080757 +/- 0.288675134595

>Not to say that something useful couldn't be done. It should be 
>possible to pass
>numbers with a precision qualifier and propagate it through your 
>equations, but
>nobody has done this and I don't know of any other numerical 
>that do.
>Happy computing,

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