Subject: question for list From: Max Karoubi Date: Fri, 24 Sep 2004 12:08:42 +0200 To: Don Davis I have the following question for the topology list : In 1957, Emery Thomas generalized the Pontrjagin square as cohomology operations from H^2n (with Z/p^r coefficients) to H^4n (with Z/p^{r+1} coefficients). See Memoir of the AMS Nr 27, 1957. A little bit later, Emery and Bill Browder gave an axiomatic characterization of these operations in Quart. J. Math. Oxford (2), 13 (1962), 55-60. My question is the following : has there been work after 1962 on these operations, in particular a definition using cup i-products ? -- Max KAROUBI *ADRESSE POSTALE : Equipe Topologie et Geometrie Algebriques Institut de Mathematiques de Jussieu Universite Paris 7-Denis Diderot - Case 7012 2, Place Jussieu, 75251 PARIS Cedex 05 - FRANCE *BUREAU 9D1, 175 rue du Chevaleret Paris 13e, Metro Chevaleret Tel. 33(0)1-4427-7953 ; FAX : ---6366 ; Secrétariat : --- 6932 Courriel et Web : karoubi@math.jussieu.fr ; http://www.math.jussieu.fr/~karoubi/ _____________________________________________________