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We study the dynamics of supermassive black hole binaries embedded in circumbinary gaseous discs, with the SPH code Gadget-2. The sub-parsec binary (of total mass M and mass ratio q=1/3) has excavated a gap and transfers its angular momentum to the self--

In this note we study linear systems on the blow-up of (P-1)(n) at r points in very general position. We prove that the fibers of the projections (P-1)(n) -> (P-1)(s), 1 <= s <= n - 1 can give contribution to the speciality of the linear system. This all