Re: [ProofPower] ProofPower and Discrete Math

2016-08-14 Thread Roger Bishop Jones
David, I don't quite understand what you are trying to do here. On the face of it you want a rule: p -- false-intro false But this is not possible, because it is not sound. As far as I can see Woodcock does not have a false-intro rule, he has only a false-elim rule, is that what you

Re: [ProofPower] ProofPower and Discrete Math

2016-08-14 Thread Roger Bishop Jones
On 14/08/2016 08:44, David Topham wrote: Thanks Roger, I am using slides he distributes. He has false introduction rules starting on page 24 (attached). Sorry about my poor example, please ignore that since is a confused use of this technique anyway! -Dave Looks like he changed the name.