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

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar Talk Information |

**Date and Time**: Tuesday, May 05, 2020, 12:15 pm

**Duration**: 30 minutes

**Location**: Zoom: conference room

**Speaker**: Anders Martinsson

Coin-weighing with a spring scale is a classical problem in information theory. In this problem, we are tasked with determining which among a collection of n coins are counterfeit by weighing subsets of coins. For each weighing, we get told how many coins in the chosen subset are counterfeit. A simple entropy argument shows that at least n/log(n+1) weighings are necessary to recover counterfeit coins, and various strategies are known to achieve this up to a constant factor. Motivated by recent advancements on Mastermind, we here consider a restricted version of coin-weighing, where only certain subsets of coins are permitted to be measured. We show that it is possible to achieve the analogous entropy lower bound up to a constant factor whenever the permissible sets form a matroid.

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