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January 2002, Week 4

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Subject:
Re: Math question
From:
Walter Murray <[log in to unmask]>
Reply To:
Walter Murray <[log in to unmask]>
Date:
Tue, 22 Jan 2002 19:02:32 -0600
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"Michael Berkowitz" <[log in to unmask]> wrote in message
news:a2ctrv02u0r@enews2.newsguy.com...
> Is infinity minus infinity = zero, infinity or undefined?
> Is infinity divided by infinity = one, infinity or undefined?
> Is negative infinity plus positive infinity = 0, negative infinity,
positive
> infinity, both or undefined?

In the context of binary floating-point arithmetic,  as defined by IEEE 754,
all three are invalid operations.  The result is a NaN (Not a Number).

Walter

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