[POPLmark] how to believe a twelf proof

[Robert Harper]

In response to the recent discussion on the POPLmark challenge mailing 
list, we have decided to write a brief note entitled "How To Believe a 
Twelf Proof" that summarizes the key ideas underlying the Twelf 
meta-theorem prover, which we used extensively in our solution to the 
POPLmark challenge.  The note is not intended as a guide to using the 
Twelf system, but rather as an exposition of the underlying concepts 
that appear to have caused some confusion.

Bob Harper and Karl Crary


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