Re: Help with a problem

In article <slrndo7ure.25n8.cmenzel@xxxxxxxxxxxxxxxxx>,
Chris Menzel <cmenzel@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Wed, 23 Nov 2005 04:49:35 GMT, Robert Zimmerman <rfz1@xxxxxxxxxxxx> said:
> > I'm am learning logic from Copi's book (as a hobby). There is an
> > advanced problem:
> >
> > With the rules of inference, prove the validity of:
> >
> > A
> > therefore B v ~B
> >
> > I am horribly stuck. Any help would be appreciated. I'm losing sleep.
>
> What rules of inference do you have available?

The "19 rules of inference" from Copi's book "Intro to Logic" (that's
the short answer). i.e. mp, mt, hs, ds, cd, etc etc.

thanks,

Bob
.

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