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11
votes
Accepted
What fails when using call/cc as realizer of the Peirce formula
I'm not sure what you mean by 'fail' here.
It is true, as you say, that classical proofs can exhibit behaviour that constructive proofs can't. In general, it's no longer true that a term of type A r …
4
votes
Positive & Negative Arity
Edit: Jason Rute beat me to it by 52 seconds.
From a quick look at that paper it seems negative arity refers to contravariance: e.g. if $A \vdash B$, then $\lnot B \vdash \lnot A$. It's all explaine …