Bulletin of the Brazilian Mathematical Society, New Series

Fernandes, Nair

doi: 10.1007/BF02584828pmid: N/A

Any torsion unit inZZS 4 is rationally conjugate to a trivial unit.

Iusem, Alfredo; Moledo, Leonardo

doi: 10.1007/BF02584829pmid: N/A

Iterative algorithms for the Convex Feasibility Problem can be modified so that at iterationk the original convex sets are perturbed with a parameter εk which tends to zero ask increases. We establish conditions on such algorithms which guarantee existence of a sequence of perturbation parameters which make them finitely convergent when applied to a convex feasibility problem whose feasible set has non empty interior.

Mendoza, Ramón

doi: 10.1007/BF02584830pmid: N/A

Przytycki, Feliks

doi: 10.1007/BF02584831pmid: N/A

Vainsencher, Israel

doi: 10.1007/BF02584832pmid: N/A

We show the component of the Hilbert scheme of twisted cubic curves is the blowup of the variety of determinantal nets along the subvariety of nets with a fixed plane.