Script from JKR's reading

[puduhepa98 at aol.com]

No: HPFGUIDX 156831

> Nikkalmati:
> I can't agree with your analysis of the respective  statements.
> If"A is true, then B is not true."
> From this statement  you cannot extract "If B is true, A is not true."

>Neri:
You are  correct. This still leaves an alternative possibility "A is
not true and B is  not true". However, here we have additional
information: JKR also tells us  that B is true (that is, that
Dumbledore *is* dead). This strikes down the  alternative possibility
and therefore we are left only with "A is not true  and B is true"
(that is, Snape isn't good and Dumbledore is dead). 
 
>Elisabet dusts off her mathematician hat)
Er, nope. The statement "P  implies Q" *is* equivalent to "(Not Q)
implies (not P)". 


Nikkalmati: (not a mathematician so I am not sure the ramifications of  using 
"implies")
Let me try an example:
Proposed statement:  If A is a doctor, B did not die.
Assuming B did die, does that prove A is not a doctor?
No
Of course, it is just as likely A is or is not a doctor.  We can't  tell - 
again JKR slips away.
Nikkalmati


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