John, List:
No one is disputing that there are two operations (erasure and insertion)
and three symmetric pairs of permissions for performing them. I have
simply pointed out that according to Peirce--not just once, but in several
different passages--negation is not a *primitive* in logic, it is *
Jon AS, List,
As I mentioned in my reply to Jeff, Peirce's ideas
were often far ahead of his time, and it's important to see which of them
not only stood the test of time, but even improved on later developments.
I changed the subject line to emphasize a critical issue that famous
logicians (F
