Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Thursday, March 30, 2017, 12:15 pm

**Duration**: 30 minutes

**Location**: CAB G51

**Speaker**: Patrick Schnider

Assume you have a pizza consisting of four ingredients (e.g. bread, tomatoes, cheese and olives) that you want to share with your friend. You want to do this fairly, meaning that you and your friend should get the same amount of each ingredient. How many times do you need to cut the pizza so that this is possible? We will show that two straight cuts always suffice. More general, we will show the following extension of the well-known Ham-Sandwich Theorem: Given four mass distributions in the plane, they can be simultaneously bisected with two lines. That is, there exist two oriented lines with the following property: let L be the region of the plane that lies to the left of both lines and let R be the region of the plane that lies to the right of both lines. Then the union of L and R contains exactly half of each mass distribution. This is joint work with Luis Barba

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