Re: Revised version of Level 1 text (draft)
Dominique and all
On 11 May 2011, at 15:51, Dominique Lohez wrote:
> The gist (see Arnold's 5 Dec 2010 paper, first few paras of 22 Jan revised version of §6, quoted below) is:
>> These are not interval extensions of point functions, so one needs
>
> This statement is clearly wrong for intersection, it is questionable for union.
What you say is correct. I did raise this idea with Arnold in November 2010, but he wasn't much impressed and wrote
> It is a curiosity but nothing of interest, for two reasons:
>
> I never saw anyone use this operation as an arithmetic operation;
> it is supported by no programming language.
>
> It also hasn't the properties required for the applications
> to b&b.
Regards
John