On 07 Jun 2012, at 01:58, Russell Standish wrote:
I've deleted the previous thread,
It is possible to delete thread? Including my posts? That should not
so I've started a new one on modal
IIUC, if I have p (true in a world), and by dint of whatever
convoluted steps, I have
then it is also true that q (q must be true in all worlds)?
Not necessarily. It can depend on what axioms are used on "p/q". Nor
is it necessary that you get p -> q, nor p-> q. Modal logic does not
obey to the deduction theorem.
In fact we have p/p for any p. If you were correct we would have p
for any p.
Could this also be written
I don't see any reason for this.
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