Verified Commit e85a1027 authored by Paolo G. Giarrusso's avatar Paolo G. Giarrusso
Browse files

Sketch proof

parent 8d0ef7c5
......@@ -72,6 +72,13 @@ This rule looks different from the above ones, because we still do not have that
{\later\prop \proves \prop}
The proof of the former is $\later \prop \proves \diamond \prop =
\later\FALSE \lor \prop$, and then by straightforward disjunction elimination:
% Cut the second part if trivial.
\infer{\later\FALSE \proves \later \propB \and \prop \proves \later \propB}
{\later\FALSE \lor \prop \proves \propB}
The following rules can be derived about except-0:
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