00932nas a2200121   4500008004300000245004500043210004400088260001300132520058700145100002200732700002000754856003600774       2002                        en_Ud  00aInstanton algebras and quantum 4-spheres0 aInstanton algebras and quantum 4spheres  bElsevier3 aWe study some generalized instanton algebras which are required to describe `instantonic complex rank 2 bundles\\\'. The spaces on which the bundles are defined are not prescribed from the beginning but rather are obtained from some natural requirements on the instantons. They turn out to be quantum 4-spheres $S^4_q$, with $q\\\\in\\\\IC$, and the instantons are described by self-adjoint idempotents e. We shall also clarify some issues related to the vanishing of the first Chern-Connes class $ch_1(e)$ and on the use of the second Chern-Connes class $ch_2(e)$ as a volume form.1 aDabrowski, Ludwik1 aLandi, Giovanni  uhttp://hdl.handle.net/1963/3134