On Fri, Jul 1, 2011 at 8:47 AM, israel vainsencher wrote: waw! best news of the week, perhaps of the month! the question now is how to ensure, a priori, if the accuracy sufficed! cheers i On Thu, Jun 30, 2011 at 6:07 PM, Jonathan Hauenstein wrote: Israel, You are correct. Since the system is overdetermined, Bertini has to determine which solutions of the randomized system it actually solved are solutions of the original system. By increasing the accuracy of the solutions to the randomized system, we have the following for your system: Multiplicity | Number of real solns | Number of non-real solns ------------------------------------------------------------------------------------------ 1 | 0 | 5440 Thanks, Jon