Thus spake "Brent Easton":
>
> >2- does a negation operator exist
> >for example: !(property1=a && property2=b)
>
> Don't forget Boole's law:
>
>   !(property1=a && property2=b)
>
> is equivalent to
>
>   property1!=a || property2!=b
>

Not really on topic, but as a logician I can't help but comment:
The logical equivalence here is called De Morgan's Law, not
Boole's Law. :)

--
J.


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