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 A. Steger, D. Steurer and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Thursday, March 02, 2023, 12:15 pm

Duration: 30 minutes

Location: OAT S15/S16/S17

Speaker: David Ellis Hershkowitz

Hop-Bounded Flows

Computing routing schemes that support both high throughput and low latency is one of the core challenges of network optimization. Such routes can be formalized as h-length flows which are defined as flows whose flow paths are restricted to have length at most h. Many well-studied algorithmic primitives---such as maximal and maximum length-constrained disjoint paths---are special cases of h-length flows. Likewise the optimal h-length flow is a fundamental quantity in network optimization, characterizing, up to poly-log factors, how quickly a network can accomplish numerous distributed primitives. We give the first efficient algorithms for computing (1 - eps)-approximate h-length flows that are ``as integral as possible.'' We give deterministic algorithms that take ~O(m*poly(h)) sequential time and poly(h)*2^(O(sqrt(log n))) distributed time. We use these algorithms to simplify deterministic distributed algorithms for computing expander decompositions and to give the first efficient, distributed and deterministic (1 - eps)-approximation algorithms for bipartite b-matching. Joint work with Bernhard Haeupler and Thatchaphol Saranurak.

Upcoming talks     |     All previous talks     |     Talks by speaker     |     Upcoming talks in iCal format (beta version!)

Previous talks by year:   2024  2023  2022  2021  2020  2019  2018  2017  2016  2015  2014  2013  2012  2011  2010  2009  2008  2007  2006  2005  2004  2003  2002  2001  2000  1999  1998  1997  1996  

Information for students and suggested topics for student talks

Automatic MiSe System Software Version 1.4803M   |   admin login