On 2011-01-06, at 21:18, John Cowan wrote:

> Vincent Manis scripsit:
>> I intended to rule out --++, but did want to keep --+-. Or did I
>> misunderstand your comment?
>
> Sorry, I meant +x-x, bignums without flonums.

I don't see a persuasive case for +x-x.

-- v

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