no. 6
Bar complexes and extensions of classical exponential functors
[Complexes bar et extensions de foncteurs exponentiels classiques]
Touzé, Antoine1
1 Université Paris 13 Sorbonne Paris Cité, LAGA, CNRS, UMR 7539, F-93430, Villetaneuse (France)
Annales de l'Institut Fourier, Tome 64 (2014) no. 6, pp. 2563-2637.

Nous calculons les groupes d’Ext entre foncteurs exponentiels classiques (i.e. puissances symétriques, extérieures ou divisées), et leur précomposition par le foncteur de torsion de Frobenius. Notre méthode repose sur les constructions bar, et relie ces calculs d’Ext avec l’homologie des espaces d’Eilenberg et Mac Lane.

Cet article complète des résultats précédents de l’auteur, et fournit une approche alternative aux calculs d’Ext classiques dans la catégorie des foncteurs strictement polynomiaux sur un corps. Nous obtenons aussi des calculs d’Ext notables pour les foncteurs strictement polynomiaux sur les entiers.

We compute Ext-groups between classical exponential functors (i.e. symmetric, exterior or divided powers) and their Frobenius twists. Our method relies on bar constructions, and bridges these Ext-groups with the homology of Eilenberg-Mac Lane spaces.

This article completes earlier results of the author, and provides an alternative approach to classical Ext-computations in the category of strict polynomial functors over fields. We also obtain significant Ext-computations for strict polynomial functors over the integers.

DOI : 10.5802/aif.2921
Classification : 18G15, 57T30, 20G10
Keywords: Strict polynomial functors, extensions, bar complexes, Eilenberg-Mac Lane spaces, Frobenius twist
Mot clés : foncteurs strictement polynomiaux, extensions, complexes bar, espaces d’Eilenberg-Mac Lane, torsion de Frobenius

Touzé, Antoine 1

1 Université Paris 13 Sorbonne Paris Cité, LAGA, CNRS, UMR 7539, F-93430, Villetaneuse (France) 
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Touzé, Antoine. Bar complexes and extensions of classical exponential functors. Annales de l'Institut Fourier, Tome 64 (2014) no. 6, pp. 2563-2637. doi : 10.5802/aif.2921. https://aif.centre-mersenne.org/articles/10.5802/aif.2921/

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