Tim Porter, Letter to the authors and Rajeev Gore, August 04th 1999, Available from T. Porter or the authors.

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On the Geometry of Intuitionistic S4 Proofs - Goubault-Larrecq, Goubault (2001)   (Correct)

....Bierman and de Paiva considered non strict CS4 categories [7] We shall only need the strict variant; this will make our exposition simpler. In particular b with the comonad of De nition 49 is a strict CS4 category. The functor on b is related to Duskin and Illusie s d ecalage functor [43]. Standardly, d ecalage is dual to . For every a.s. set K, the converse K of K is obtained by letting ( K) q =K q , i K q = q i K q , s i K q =s q i K q . That is, K is obtained from K by reversing the order of faces. Then K is the converse of K. If K in a ....

Tim Porter, Letter to the authors and Rajeev Gore, August 04th 1999, Available from T. Porter or the authors.

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