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Une formule pour les extensions de foncteurs composés

Alain Troesch (2003)

Fundamenta Mathematicae

Let p be a prime, and let ℱ be the category of functors from the finite p -vector spaces to all p -vector spaces. The object Id of ℱ is the inclusion functor. Let F and G be two objects in ℱ. If F and G satisfy suitable conditions, the main result of this paper allows one to compute E x t * ( I d , G F ) from the knowledge of E x t * ( I d , F ) and E x t * ( I d , G ) .

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