Pedro E.N. Ramos

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Given a set B of n blue points in general position, we say that a set of red points R blocks B if in the Delaunay triangulation of B ∪ R there is no edge connecting two blue points. We give the following bounds for the size of the smallest set R blocking B: (i) 3n/2 red points are always sufficient to block a set of n blue points, (ii) if B is in convex(More)
OBJECTIVE Endoscopic ultrasound-guided choledochoduodenostomy (EUS-CD) has become an alternative method after unsuccessful endoscopic retrograde cholangiopancreatography (ERCP) treatment. We present a case series study and its feasibility by using only a linear therapeutic channel echoendoscope to create both a biliary-enteral fistula and anatomic enteral(More)
  • Citation Aichholzer, Franz Oswin, Erik D Aurenhammer, Ferran Demaine, Pedro Hurtado, Jorge Ramos +7 others
  • 2010
The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. Abstract We introduce a notion of k-convexity and explore polygons in the plane that have this property. Polygons which are k-convex can be triangulated with fast yet simple algorithms. However, recognizing them in general is a 3SUM-hard(More)
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