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math.GR2010
Groups with faithful irreducible projective unitary representations
Bachir Bekka, Pierre de la Harpe
For a countable group G and a multiplier c on G with values in the circle, we study the property of G having a unitary projective c-representation which is both irreducible and pro…
math.GR2010★ 1 cited
Topologie, théorie des groupes et problèmes de décision. Célébration d'un article de Max Dehn de 1910
Pierre de la Harpe
This paper, in French, is a celebration of Max Dehn, and an essay of describing some of his results published in the beginning of the 1910's, and their offspring. It has been writt…