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It was proved by Jacques Dixmier (Sur les représentations unitaires des groupes de Lie algébriques, Annales de l'institut Fourier, 7 (1957), p. 315-328, doi: 10.5802/aif.73, MR 20 #5820 , Zbl 0080.32101 )

that algebraic groups over the reals, are type I. Is a similar result known for algebraic groups over non-archimedean local fields (possibly of characteristic 0)? I am only aware of the result by Berstein

http://www.math.tau.ac.il/~bernstei/Publication_list/publication_texts/bernstein-P-tame-FAN.pdf

that reductive algebraic groups over non-archimedean local fields, are type I.

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Your first link doesn't work for me:( –  Marc Palm Apr 17 '13 at 12:08
1  
@Marc: Yes there is something weird with the link, that I couldn't fix. I put the reference instead. –  Alain Valette Apr 18 '13 at 11:04
    
    
Or for those not able to speak french: ams.org/mathscinet/search/… –  Marc Palm Apr 18 '13 at 11:12

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