"Andreas Huber" <ah2003@[...].net>  writes:

>  The assumptions are based on practical experience, which is of course not
>  provable. Since you seem to accept only strictly provable
>  arguments, 

No, examples carry a lot of weight with me.  So far you've provided
none in support of A1.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com

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