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#19105
gerard.casey
Participant

Ted: Sorry for the delay in responding. I’ve only just seen your post.

In answer to the first part of you question: yes, PIR or RIP is correct. As you note, they are effectively the same proposition (by conversion) and are also equivalent to POR(complement) and ROP(complement) by obversion.

I’m not quite sure what you intend by the second part to your question. Did you miswrite ‘convert’ for ‘obvert’? Because what you did was to obvert the second premise, thereby getting rid of the complement on its predicate. You weren’t wrong to do this – it just wasn’t absolutely necessary as the two premises as they stood contained three and only three terms.

If I haven’t understood the second part of your question correctly, come back to me again.

I hope this helps somewhat.