Things were pretty clear after David's explanation.
Now they are even more clear.
Thank you all!
Best regards

2009/2/15 Raphael Collet <[email protected]>

> Dear Quirino,
>
> On Sun, Feb 15, 2009 at 12:25 PM, Quirino Zagarese <
> [email protected]> wrote:
>
>> Of course I'm seeing it's a very powerful feature.
>> I was just trying to understand why the expression _|1 does not match
>> 4|3|2|1 even if _ matches 4|3|2.
>
>
> That's because 4|3|2|1 = 4|(3|2|1) (*).  Matching this with _|1 is like
> checking whether the equation _|1 = 4|(3|2|1) is consistent.  This equation
> can be decomposed into:
>
>         _ = 4          % consistent
>         1 = 3|2|1      % inconsistent!
>
> Cheers,
> raph
>
>
>
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-- 
Quirino Zagarese

LaszloItalia Founder (www.laszloitalia.org)
Software Development Manager - Galilaeus s.r.l.
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