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

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with M. Ghaffari, A. Steger and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Tuesday, June 22, 2004, 12:15 pm

Duration: This information is not available in the database

Location: This information is not available in the database

Speaker: Moshe Lewenstein (Bar Ilan Univ.)

Peeling Codes with Applications to Finding Witnesses

We consider the general setting in which there is a set S, with elements taken from some commutative group G, of which we seek to discover k elements. The set S is not provided to us explicitly. Rather, we are provided procedures such that for any set A, we can compute the size of S ∩ A and the sum (in the group) of the elements in this intersection. We are interested in minimizing the total work to discover the k elements. We introduce the notion of Peeling Collections (or Peeling Codes) which provide efficient solutions to several versions of this general setting. We then show that the solution to this general problem provides improved algorithms for several known and new problems. These include: the k-witnesses (mismatches), the k-aligned ones, and the half-rectangular matching problems; the k-witnesses for boolean matrix multiplication, and the all pairs k-shortest paths problems; and the counterfeit coin finding problem.

(Joint work with Yonatan Aumann, Noa Lewenstein and Dekel Tsur)

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