00929nas a2200121 4500008003900000245007100039210006900110520052100179100002100700700001500721700002000736856005100756 2014 d00aPimsner algebras and Gysin sequences from principal circle actions0 aPimsner algebras and Gysin sequences from principal circle actio3 aA self Morita equivalence over an algebra B, given by a B-bimodule E, is thought of as a line bundle over B. The corresponding Pimsner algebra O_E is then the total space algebra of a noncommutative principal circle bundle over B. A natural Gysin-like sequence relates the KK-theories of O_E and of B. Interesting examples come from O_E a quantum lens space over B a quantum weighted projective line (with arbitrary weights). The KK-theory of these spaces is explicitly computed and natural generators are exhibited.1 aArici, Francesca1 aKaad, Jens1 aLandi, Giovanni uhttp://urania.sissa.it/xmlui/handle/1963/34461